15 files changed, 885 insertions, 0 deletions
diff --git a/36114-t/images/025.pdf b/36114-t/images/025.pdf
new file mode 100644
index 0000000..f91bda1
--- /dev/null
+++ b/36114-t/images/025.pdf
diff --git a/36114-t/images/032.pdf b/36114-t/images/032.pdf
new file mode 100644
index 0000000..3ff495d
--- /dev/null
+++ b/36114-t/images/032.pdf
diff --git a/36114-t/images/040.pdf b/36114-t/images/040.pdf
new file mode 100644
index 0000000..6ed50b6
--- /dev/null
+++ b/36114-t/images/040.pdf
diff --git a/36114-t/images/087.pdf b/36114-t/images/087.pdf
new file mode 100644
index 0000000..f0c4b55
--- /dev/null
+++ b/36114-t/images/087.pdf
diff --git a/36114-t/images/127.pdf b/36114-t/images/127.pdf
new file mode 100644
index 0000000..e68ff46
--- /dev/null
+++ b/36114-t/images/127.pdf
diff --git a/36114-t/images/sources/025.eepic b/36114-t/images/sources/025.eepic
new file mode 100644
index 0000000..06602b0
--- /dev/null
+++ b/36114-t/images/sources/025.eepic
@@ -0,0 +1,42 @@
+%% Generated from 025.xp on Tue May 10 18:52:03 EDT 2011 by
+%% ePiX-1.2.4
+%% 
+%%   Cartesian bounding box: [-2,2] x [-0.25,0.25]
+%%   Actual size: 4 x 0.5in
+%%   Figure offset: left by 0in, down by 0in
+%% 
+%% usepackages tikz
+%% 
+\xdefinecolor{rgb_000000}{rgb}{0,0,0}%
+\begin{tikzpicture}
+\pgfsetlinewidth{0.4pt}
+\useasboundingbox (0in,0in) rectangle (4in,0.5in);
+\pgfsetlinewidth{0.8pt}
+\draw (0in,0.25in)--(2in,0.25in)--(4in,0.25in);
+\draw (0.25in,0.35in)--(2in,0.35in)--(3.75in,0.35in);
+\draw (3.75in,0.35in)--(3.8in,0.4in)--(3.85in,0.45in);
+\pgftext[at={\pgfpoint{2in}{0.25in}}] {\makebox(0,0){\hbox{\color{rgb_000000}$\rule{0.5pt}{6pt}$}}}
+\pgftext[at={\pgfpoint{2in}{0.35in}}] {\makebox(0,0){\hbox{\color{rgb_000000}$\rule{0.5pt}{6pt}$}}}
+\pgftext[at={\pgfpoint{1in}{0.25in}}] {\makebox(0,0){\hbox{\color{rgb_000000}$\rule{0.5pt}{12pt}$}}}
+\pgftext[at={\pgfpoint{1in}{0.35in}}] {\makebox(0,0){\hbox{\color{rgb_000000}$\rule{0.5pt}{12pt}$}}}
+\pgftext[at={\pgfpoint{3in}{0.25in}}] {\makebox(0,0){\hbox{\color{rgb_000000}$\rule{0.5pt}{12pt}$}}}
+\pgftext[at={\pgfpoint{3in}{0.35in}}] {\makebox(0,0){\hbox{\color{rgb_000000}$\rule{0.5pt}{12pt}$}}}
+\draw (0.25in,0.45in)--(0.75in,0.45in);
+\pgfsetfillcolor{rgb_000000}
+\draw [fill](0.736163in,0.45in)--(0.722326in,0.436163in)--
+  (0.75in,0.45in)--(0.722326in,0.463837in)--(0.736163in,0.45in)--cycle;
+\pgftext[at={\pgfpoint{0.277674in}{0.477674in}}] {\makebox(0,0)[bl]{\hbox{\color{rgb_000000}$v$}}}
+\draw (3.25in,0.45in)--(3.75in,0.45in);
+\draw [fill](3.73616in,0.45in)--(3.72233in,0.436163in)--
+  (3.75in,0.45in)--(3.72233in,0.463837in)--(3.73616in,0.45in)--cycle;
+\pgftext[at={\pgfpoint{3.27767in}{0.477674in}}] {\makebox(0,0)[bl]{\hbox{\color{rgb_000000}$v$}}}
+\draw (2.125in,0.55in)--(2.625in,0.55in);
+\draw [fill](2.61116in,0.55in)--(2.59733in,0.536163in)--
+  (2.625in,0.55in)--(2.59733in,0.563837in)--(2.61116in,0.55in)--cycle;
+\pgftext[at={\pgfpoint{2.06965in}{0.55in}}] {\makebox(0,0)[r]{\hbox{\color{rgb_000000}$M'$}}}
+\pgftext[at={\pgfpoint{1in}{0.11163in}}] {\makebox(0,0)[t]{\hbox{\color{rgb_000000}$A$}}}
+\pgftext[at={\pgfpoint{2in}{0.11163in}}] {\makebox(0,0)[t]{\hbox{\color{rgb_000000}$M$}}}
+\pgftext[at={\pgfpoint{3in}{0.11163in}}] {\makebox(0,0)[t]{\hbox{\color{rgb_000000}$B$}}}
+\pgftext[at={\pgfpoint{3.90535in}{0.45in}}] {\makebox(0,0)[l]{\hbox{\color{rgb_000000}\textit{Train}}}}
+\pgftext[at={\pgfpoint{3.66791in}{0.139304in}}] {\makebox(0,0)[tl]{\hbox{\color{rgb_000000}\textit{Embankment}}}}
+\end{tikzpicture}
diff --git a/36114-t/images/sources/025.xp b/36114-t/images/sources/025.xp
new file mode 100644
index 0000000..5bc71f0
--- /dev/null
+++ b/36114-t/images/sources/025.xp
@@ -0,0 +1,51 @@
+/* -*-ePiX-*- */
+#include "epix.h"
+using namespace ePiX;
+
+double mA(-1), mB(1), mM(0), dx(0.5), dy(0.1);
+
+void veloc(const P& loc, const P& off,
+	   const std::string& msg, epix_label_posn A)
+{
+  arrow(loc, loc + P(dx,0));
+  label(loc, off, msg, A);
+}
+
+int main()
+{
+  picture(P(-2,-0.25), P(2,0.25), "4 x 0.5in");
+
+  begin();
+  bold();
+  arrow_inset(0.5);
+  arrow_ratio(2);
+  arrow_width(2);
+
+  line(P(xmin(), 0), P(xmax(), 0));
+  line(P(xmin()+0.25, dy), P(xmax()-0.25, dy));
+  line(P(xmax()-0.25, dy), P(xmax()-0.15, dy + 0.1));
+
+  h_axis_tick(P(mM,0));
+  h_axis_tick(P(mM,dy));
+
+  tick_size(6);
+  h_axis_tick(P(mA,0));
+  h_axis_tick(P(mA,dy));
+
+  h_axis_tick(P(mB,0));
+  h_axis_tick(P(mB,dy));
+
+  veloc(P(xmin()+0.25, 2*dy), P(2,2), "$v$", tr);
+  veloc(P(mB+0.25, 2*dy), P(2,2), "$v$", tr);
+  veloc(P(mM+0.125, 3*dy), P(-4,0), "$M'$", l);
+
+  label(P(mA,0), P(0,-10), "$A$", b);
+  label(P(mM,0), P(0,-10), "$M$", b);
+  label(P(mB,0), P(0,-10), "$B$", b);
+
+  label(P(xmax()-0.15, dy + 0.1), P(4,0), "\\textit{Train}", r);
+  label(P(xmax(), 0), P(-24,-8), "\\textit{Embankment}", br);
+
+  tikz_format();
+  end();
+}
diff --git a/36114-t/images/sources/032.eepic b/36114-t/images/sources/032.eepic
new file mode 100644
index 0000000..ce754bf
--- /dev/null
+++ b/36114-t/images/sources/032.eepic
@@ -0,0 +1,42 @@
+%% Generated from 032.xp on Wed May 11 10:08:49 EDT 2011 by
+%% ePiX-1.2.4
+%% 
+%%   Cartesian bounding box: [0,1.5] x [0,1]
+%%   Actual size: 2.4 x 1.6in
+%%   Figure offset: left by 0in, down by 0in
+%% 
+%% usepackages tikz
+%% 
+\xdefinecolor{rgb_000000}{rgb}{0,0,0}%
+\begin{tikzpicture}
+\pgfsetlinewidth{0.4pt}
+\useasboundingbox (0in,0in) rectangle (2.4in,1.6in);
+\pgfsetlinewidth{0.8pt}
+\draw (0in,0in)--(1.2in,0in)--(2.4in,0in);
+\draw (0in,0in)--(0.32in,0.32in)--(0.64in,0.64in);
+\draw (0in,0in)--(0in,0.8in)--(0in,1.6in);
+\draw (0.8in,0.08in)--(1.6in,0.08in)--(2.4in,0.08in);
+\draw (0.8in,0.08in)--(1.12in,0.4in)--(1.44in,0.72in);
+\draw (0.8in,0.08in)--(0.8in,0.88in)--(0.8in,1.68in);
+\draw (1.04in,0.16in)--(1.44in,0.16in);
+\pgfsetfillcolor{rgb_000000}
+\draw [fill](1.42616in,0.16in)--(1.41233in,0.146163in)--
+  (1.44in,0.16in)--(1.41233in,0.173837in)--(1.42616in,0.16in)--cycle;
+\pgftext[at={\pgfpoint{1.12302in}{0.187674in}}] {\makebox(0,0)[bl]{\hbox{\color{rgb_000000}$v$}}}
+\draw (1.44in,0.64in)--(1.84in,0.64in);
+\draw [fill](1.82616in,0.64in)--(1.81233in,0.626163in)--
+  (1.84in,0.64in)--(1.81233in,0.653837in)--(1.82616in,0.64in)--cycle;
+\pgftext[at={\pgfpoint{1.46767in}{0.584652in}}] {\makebox(0,0)[tl]{\hbox{\color{rgb_000000}$v$}}}
+\draw (0.88in,1.6in)--(1.28in,1.6in);
+\draw [fill](1.26616in,1.6in)--(1.25233in,1.58616in)--
+  (1.28in,1.6in)--(1.25233in,1.61384in)--(1.26616in,1.6in)--cycle;
+\pgftext[at={\pgfpoint{0.907674in}{1.54465in}}] {\makebox(0,0)[tl]{\hbox{\color{rgb_000000}$v$}}}
+\pgftext[at={\pgfpoint{0in}{-0.055348in}}] {\makebox(0,0)[t]{\hbox{\color{rgb_000000}$K$}}}
+\pgftext[at={\pgfpoint{0.8in}{-0.055348in}}] {\makebox(0,0)[t]{\hbox{\color{rgb_000000}$K'$}}}
+\pgftext[at={\pgfpoint{2.42767in}{-0.027674in}}] {\makebox(0,0)[tl]{\hbox{\color{rgb_000000}$x$}}}
+\pgftext[at={\pgfpoint{2.42767in}{0.107674in}}] {\makebox(0,0)[bl]{\hbox{\color{rgb_000000}$x'$}}}
+\pgftext[at={\pgfpoint{0.612326in}{0.667674in}}] {\makebox(0,0)[br]{\hbox{\color{rgb_000000}$y$}}}
+\pgftext[at={\pgfpoint{1.41233in}{0.747674in}}] {\makebox(0,0)[br]{\hbox{\color{rgb_000000}$y'$}}}
+\pgftext[at={\pgfpoint{0in}{1.62767in}}] {\makebox(0,0)[b]{\hbox{\color{rgb_000000}$z$}}}
+\pgftext[at={\pgfpoint{0.8in}{1.70767in}}] {\makebox(0,0)[b]{\hbox{\color{rgb_000000}$z'$}}}
+\end{tikzpicture}
diff --git a/36114-t/images/sources/032.xp b/36114-t/images/sources/032.xp
new file mode 100644
index 0000000..b432064
--- /dev/null
+++ b/36114-t/images/sources/032.xp
@@ -0,0 +1,55 @@
+/* -*-ePiX-*- */
+#include "epix.h"
+using namespace ePiX;
+
+double dx(0.5), dy(0.05), sc(0.8);
+
+void veloc(const P& loc, const P& off,
+	   const std::string& msg, epix_label_posn A)
+{
+  arrow(loc, loc + P(0.5*dx,0));
+  label(loc, off, msg, A);
+}
+
+int main()
+{
+  picture(P(0,0), P(1.5,1), "2.4 x 1.6in");
+
+  begin();
+  bold();
+  arrow_inset(0.5);
+  arrow_ratio(2);
+  arrow_width(2);
+
+  P O1(0,0), O2(dx, dy),
+    pX1(xmax(), 0), pX2(xmax(), dy),
+    pY1(sc*dx, sc*dx), pY2(O2 + pY1),
+    pZ1(0,ymax()), pZ2(O2 + pZ1);
+
+  line(O1, pX1);
+  line(O1, pY1);
+  line(O1, pZ1);
+
+  line(O2, pX2);
+  line(O2, pY2);
+  line(O2, pZ2);
+
+  veloc(O2 + P(3*dy, dy), P(6,2), "$v$", tr);
+  veloc(pY2 + P( 0, -dy), P(2,-4), "$v$", br);
+  veloc(pZ2 + P(dy, -dy), P(2,-4), "$v$", br);
+
+  label(O1, P(0,-4), "$K$", b);
+  label(O2 - P(0, dy), P(0,-4), "$K'$", b);
+
+  label(pX1, P(2,-2), "$x$", br);
+  label(pX2, P(2, 2), "$x'$", tr);
+
+  label(pY1, P(-2, 2), "$y$", tl);
+  label(pY2, P(-2, 2), "$y'$", tl);
+
+  label(pZ1, P(0, 2), "$z$", t);
+  label(pZ2, P(0, 2), "$z'$", t);
+
+  tikz_format();
+  end();
+}
diff --git a/36114-t/images/sources/040.eepic b/36114-t/images/sources/040.eepic
new file mode 100644
index 0000000..1eb70f6
--- /dev/null
+++ b/36114-t/images/sources/040.eepic
@@ -0,0 +1,23 @@
+%% Generated from 040.xp on Wed May 11 10:28:32 EDT 2011 by
+%% ePiX-1.2.4
+%% 
+%%   Cartesian bounding box: [0,3] x [-0.125,0.125]
+%%   Actual size: 3 x 0.3in
+%%   Figure offset: left by 0in, down by 0in
+%% 
+%% usepackages tikz
+%% 
+\xdefinecolor{rgb_000000}{rgb}{0,0,0}%
+\begin{tikzpicture}
+\pgfsetlinewidth{0.4pt}
+\useasboundingbox (0in,0in) rectangle (3in,0.3in);
+\pgfsetlinewidth{0.8pt}
+\draw (0in,0in)--(1.5in,0in)--(3in,0in);
+\draw (0in,0.3in)--(1.5in,0.3in)--(3in,0.3in);
+\draw (0.5in,0.15in)--(1in,0.15in);
+\pgfsetfillcolor{rgb_000000}
+\draw [fill](0.986163in,0.15in)--(0.972326in,0.136163in)--
+  (1in,0.15in)--(0.972326in,0.163837in)--(0.986163in,0.15in)--cycle;
+\pgftext[at={\pgfpoint{0.75in}{0.177674in}}] {\makebox(0,0)[b]{\hbox{\color{rgb_000000}$v$}}}
+\pgftext[at={\pgfpoint{1.5in}{0.327674in}}] {\makebox(0,0)[b]{\hbox{\color{rgb_000000}$T$}}}
+\end{tikzpicture}
diff --git a/36114-t/images/sources/040.xp b/36114-t/images/sources/040.xp
new file mode 100644
index 0000000..4c2f9c9
--- /dev/null
+++ b/36114-t/images/sources/040.xp
@@ -0,0 +1,33 @@
+/* -*-ePiX-*- */
+#include "epix.h"
+using namespace ePiX;
+
+double dx(0.5), rad(0.125);
+
+void veloc(const P& loc, const P& off,
+	   const std::string& msg, epix_label_posn A)
+{
+  arrow(loc, loc + P(dx,0));
+  label(loc + 0.5*dx, off, msg, A);
+}
+
+int main()
+{
+  picture(P(0,-rad), P(3,rad), "3 x 0.3in");
+
+  begin();
+  bold();
+  arrow_inset(0.5);
+  arrow_ratio(2);
+  arrow_width(2);
+
+  line(P(xmin(), -rad), P(xmax(), -rad));
+  line(P(xmin(),  rad), P(xmax(),  rad));
+
+  veloc(P(dx, 0), P(0,2), "$v$", t);
+
+  label(P(0.5*xmax(), ymax()), P(0,2), "$T$", t);
+
+  tikz_format();
+  end();
+}
diff --git a/36114-t/images/sources/087.eepic b/36114-t/images/sources/087.eepic
new file mode 100644
index 0000000..cda7abd
--- /dev/null
+++ b/36114-t/images/sources/087.eepic
@@ -0,0 +1,199 @@
+%% Generated from 087.xp on Thu May 12 12:37:03 EDT 2011 by
+%% ePiX-1.2.4
+%% 
+%%   Cartesian bounding box: [-2,2] x [-2,2]
+%%   Actual size: 3 x 2in
+%%   Figure offset: left by 0in, down by 0in
+%% 
+%% usepackages tikz
+%% 
+\xdefinecolor{rgb_000000}{rgb}{0,0,0}%
+\begin{tikzpicture}
+\pgfsetlinewidth{0.4pt}
+\useasboundingbox (0in,0in) rectangle (3in,2in);
+\pgfsetlinewidth{0.8pt}
+\draw (0.5864in,0.397277in)--(0.587835in,0.432446in)--
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+\draw (0.82279in,0.33057in)--(0.8368in,0.358526in)--
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+  (2.26117in,1.42297in)--(2.2995in,1.43471in)--
+  (2.33826in,1.44617in)--(2.37744in,1.45735in)--
+  (2.41705in,1.46824in)--(2.45708in,1.47885in);
+\draw (0.901144in,0.158505in)--(0.928096in,0.179495in)--
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+  (1.40755in,0.52214in)--(1.43748in,0.541146in)--
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+\pgftext[at={\pgfpoint{1.15591in}{0.277248in}}] {\makebox(0,0)[t]{\hbox{\color{rgb_000000}$P$}}}
+\filldraw[color=rgb_000000] (1.23258in,0.405039in) circle(0.0207555in);
+\pgftext[at={\pgfpoint{1.91487in}{1.71611in}}] {\makebox(0,0)[l]{\hbox{\color{rgb_000000}$u=1$}}}
+\pgftext[at={\pgfpoint{2.51242in}{1.47885in}}] {\makebox(0,0)[l]{\hbox{\color{rgb_000000}$u=2$}}}
+\pgftext[at={\pgfpoint{2.97401in}{1.15096in}}] {\makebox(0,0)[l]{\hbox{\color{rgb_000000}$u=3$}}}
+\pgftext[at={\pgfpoint{1.34383in}{0.0883968in}}] {\makebox(0,0)[l]{\hbox{\color{rgb_000000}$v=1$}}}
+\pgftext[at={\pgfpoint{2.0241in}{0.375in}}] {\makebox(0,0)[l]{\hbox{\color{rgb_000000}$v=2$}}}
+\pgftext[at={\pgfpoint{2.62577in}{0.590653in}}] {\makebox(0,0)[l]{\hbox{\color{rgb_000000}$v=3$}}}
+\end{tikzpicture}
diff --git a/36114-t/images/sources/087.xp b/36114-t/images/sources/087.xp
new file mode 100644
index 0000000..33695e6
--- /dev/null
+++ b/36114-t/images/sources/087.xp
@@ -0,0 +1,50 @@
+/* -*-ePiX-*- */
+#include "epix.h"
+using namespace ePiX;
+
+P f(double u, double v)
+{
+  double x(u*(1 - 0.25*exp(-v)) + 0.25*v*v),
+    y(v*(1 + 0.125*exp(0.5*u)) - 0.2*u*u);
+  return P(x + y, y - x);
+}
+
+const double MAX(2), maxx(1.25);
+
+domain R(P(-1,-1), P(maxx,1), mesh(60,60));
+
+int main()
+{
+  picture(P(-MAX,-MAX), P(MAX,MAX), "3 x 2in");
+
+  begin();
+  bold();
+
+  double mu1(-0.8), mu2(-0.1), mu3(0.6),
+    mv1(-0.6), mv2(0), mv3(0.5);
+
+  P u1(f(mu1, 1)), u2(f(mu2, 1)), u3(f(mu3, 1)),
+    v1(f(maxx, mv1)), v2(f(maxx, mv2)), v3(f(maxx, mv3)),
+    O(f(mu3, mv1));
+
+  plot(f, R.slice1(mu1));
+  plot(f, R.slice1(mu2));
+  plot(f, R.slice1(mu3));
+
+  plot(f, R.slice2(mv1));
+  plot(f, R.slice2(mv2));
+  plot(f, R.slice2(mv3));
+
+  dot(O, P(-4,-10), "$P$", b);
+
+  label(u1, P(4,0), "$u=1$", r);
+  label(u2, P(4,0), "$u=2$", r);
+  label(u3, P(4,0), "$u=3$", r);
+
+  label(v1, P(4,0), "$v=1$", r);
+  label(v2, P(4,0), "$v=2$", r);
+  label(v3, P(4,0), "$v=3$", r);
+
+  tikz_format();
+  end();
+}
diff --git a/36114-t/images/sources/127.eepic b/36114-t/images/sources/127.eepic
new file mode 100644
index 0000000..0a5c284
--- /dev/null
+++ b/36114-t/images/sources/127.eepic
@@ -0,0 +1,341 @@
+%% Generated from 127.xp on Wed May 11 11:13:40 EDT 2011 by
+%% ePiX-1.2.4
+%% 
+%%   Cartesian bounding box: [0,1] x [0,3]
+%%   Actual size: 1 x 3in
+%%   Figure offset: left by 0in, down by 0in
+%% 
+%% usepackages tikz
+%% 
+\xdefinecolor{rgb_000000}{rgb}{0,0,0}%
+\begin{tikzpicture}
+\pgfsetlinewidth{0.4pt}
+\useasboundingbox (0in,0in) rectangle (1in,3in);
+\pgfsetlinewidth{0.8pt}
+\draw (0.25in,1in)--(0.4375in,0.953125in)--(0.625in,0.90625in);
+\draw (0.125in,-0.03125in)--(0.134375in,0.00625in);
+\draw (0.153125in,0.08125in)--(0.1625in,0.11875in);
+\draw (0.1625in,0.11875in)--(0.171875in,0.15625in);
+\draw (0.190625in,0.23125in)--(0.2in,0.26875in);
+\draw (0.2in,0.26875in)--(0.209375in,0.30625in);
+\draw (0.228125in,0.38125in)--(0.2375in,0.41875in);
+\draw (0.2375in,0.41875in)--(0.246875in,0.45625in);
+\draw (0.265625in,0.53125in)--(0.275in,0.56875in);
+\draw (0.275in,0.56875in)--(0.284375in,0.60625in);
+\draw (0.303125in,0.68125in)--(0.3125in,0.71875in);
+\draw (0.3125in,0.71875in)--(0.321875in,0.75625in);
+\draw (0.340625in,0.83125in)--(0.35in,0.86875in);
+\draw (0.35in,0.86875in)--(0.359375in,0.90625in);
+\draw (0.378125in,0.98125in)--(0.3875in,1.01875in);
+\draw (0.3875in,1.01875in)--(0.396875in,1.05625in);
+\draw (0.415625in,1.13125in)--(0.425in,1.16875in);
+\draw (0.425in,1.16875in)--(0.434375in,1.20625in);
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+\pgfsetlinewidth{2pt}
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+\draw (0.374315in,0.986934in)--(0.374444in,0.988565in);
+\draw (0.3747in,0.991827in)--(0.374829in,0.993458in);
+\draw (0.374829in,0.993458in)--(0.374872in,0.995094in);
+\draw (0.374957in,0.998365in)--(0.375in,1in);
+\pgftext[at={\pgfpoint{0.097326in}{1in}}] {\makebox(0,0)[r]{\hbox{\color{rgb_000000}$S$}}}
+\pgftext[at={\pgfpoint{0.097326in}{-0.058924in}}] {\makebox(0,0)[tr]{\hbox{\color{rgb_000000}$E$}}}
+\filldraw[color=rgb_000000] (0.125in,-0.03125in) circle(0.0207555in);
+\pgftext[at={\pgfpoint{0.219652in}{0.56875in}}] {\makebox(0,0)[r]{\hbox{\color{rgb_000000}$D_{1}$}}}
+\pgftext[at={\pgfpoint{0.530348in}{0.625in}}] {\makebox(0,0)[l]{\hbox{\color{rgb_000000}$D_{2}$}}}
+\pgftext[at={\pgfpoint{1.10535in}{2.60625in}}] {\makebox(0,0)[l]{\hbox{\color{rgb_000000}$D_{1}$}}}
+\pgftext[at={\pgfpoint{0.475in}{1.10312in}}] {\makebox(0,0)[c]{\rotatebox{-14.0362}{\hbox{\color{rgb_000000}$\overbrace{\rule{0.35in}{0pt}}^{\mbox{\;$\Delta$}}$}}}}
+\end{tikzpicture}
diff --git a/36114-t/images/sources/127.xp b/36114-t/images/sources/127.xp
new file mode 100644
index 0000000..9434273
--- /dev/null
+++ b/36114-t/images/sources/127.xp
@@ -0,0 +1,49 @@
+/* -*-ePiX-*- */
+#include "epix.h"
+using namespace ePiX;
+
+int main()
+{
+  picture(P(0,0), P(1,3), "1 x 3in");
+
+  begin();
+  bold();
+  arrow_inset(0.5);
+  arrow_ratio(2);
+  arrow_width(2);
+  double rad(0.125);
+
+  P dir(0.25, 1), perp(-rad*J(dir)), sun(dir), earth(perp), bend(sun + 3*perp),
+    D1a(earth + 0.6*dir), D2(0.3*earth + 0.7*bend), D1b(bend + 1.7*dir);
+
+  double th(Atan2(perp.x2(), perp.x1()));
+
+  line(sun, sun + 3*perp);
+
+  dashed();
+  dash_size(12);
+  line(earth, earth + 1.8*dir);
+  line(earth, bend);
+  line(bend, bend + 1.8*dir);
+
+  arrow(D1a, D1a + 0.01*dir);
+  arrow(D2, D2 + 0.01*(bend - earth));
+  arrow(D1b, D1b + 0.01*dir);
+
+  pen(2);
+  circle(sun, rad);
+
+  label(sun - P(rad, 0), P(-2,0), "$S$", l);
+  dot(earth, P(-2,-2), "$E$", bl);
+
+  label(D1a, P(-4,0), "$D_{1}$", l);
+  label(D2, P( 4,0), "$D_{2}$", r);
+  label(D1b, P( 4,0), "$D_{1}$", r);
+
+  label_angle(th);
+  label(sun + 0.15*dir + 1.5*perp,
+	"$\\overbrace{\\rule{0.35in}{0pt}}^{\\mbox{\\;$\\Delta$}}$");
+
+  tikz_format();
+  end();
+}