chapter 4 almost rewritten

changed gfx

tex/gfx/eval/path_nexus_detail.eps

@@ -1,7 +1,7 @@
 %!PS-Adobe-2.0 EPSF-2.0
 %%Title: path_nexus_detail.tex
 %%Creator: gnuplot 5.0 patchlevel 1
-%%CreationDate: Tue Feb 16 19:12:37 2016
+%%CreationDate: Wed Feb 17 14:45:48 2016
 %%DocumentFonts: 
 %%BoundingBox: 50 50 302 226
 %%EndComments
@@ -441,7 +441,7 @@ SDict begin [
   /Author (kazu)
 %  /Producer (gnuplot)
 %  /Keywords ()
-  /CreationDate (Tue Feb 16 19:12:37 2016)
+  /CreationDate (Wed Feb 17 14:45:48 2016)
   /DOCINFO pdfmark
 end
 } ifelse
@@ -553,14 +553,14 @@ stroke
 LTb
 LCb setrgbcolor
 LTb
-103 89 N
+1687 89 N
 0 440 V
-1409 0 V
+-175 0 V
 0 -440 V
-103 89 L
+175 0 V
 Z stroke
-103 529 M
-1409 0 V
+1687 529 M
+-175 0 V
 stroke
 0.80 0.80 0.80 C 2555 1288 M
 -50 -15 V
@@ -4668,19 +4668,19 @@ LC2 setrgbcolor
 221 0 V
 stroke
 LCw setrgbcolor
-1.000 103 89 1409 440 BoxColFill
+1.000 1687 89 -175 440 BoxColFill
 1.000 UL
 LTb
 LCb setrgbcolor
 LTb
-103 89 N
+1687 89 N
 0 440 V
-1409 0 V
+-175 0 V
 0 -440 V
-103 89 L
+175 0 V
 Z stroke
-103 529 M
-1409 0 V
+1687 529 M
+-175 0 V
 stroke
 0.80 0.80 0.80 C 1.000 UL
 LTb