--- a/colophon.roff	Sun Jul 15 18:41:35 2012 +0200
+++ b/colophon.roff	Sun Jul 15 18:41:48 2012 +0200
@@ -17,7 +17,13 @@
 Unfortunately, I must admit that the troff sources are not perfectly
 portable as I accessed Heirloom troff extensions and ms internals,
 occasionally.
-.P
+The typesetting command line read something like:
+.VS
+export TROFFONTS=fonts REFER=bib
+soelim style *.roff | \
+	refer -e -P -sLAD -l,2 -k | tbl | grap | pic | \
+	troff -Tps -ms -mpictures 2>err.ig | dpost >thesis.ps
+VE
 My document preparation setup was inspired and guided by
 Dougherty and O'Reilly's
 .I "UNIX Text Processing
@@ -27,12 +33,20 @@
 .I "Nroff/Troff User's Manual
 helped with definitive answers.
 .P
-The typesetting command line read something like:
-.VS
-export TROFFONTS=fonts REFER=bib
-soelim style *.roff | refer -e -P -sLAD -l,2 -k | \
-        tbl | grap | pic | troff -Tps -ms 2>err.ig | dpost >thesis.ps
-VE
+The mail agent diagramm was written in
+.I pic .
+The figures displaying the number of switches and the amount of
+code through time were created with
+.I grap .
+The build dependency graph was generated with
+.I dot .
+Source data was preprocessed with
+.I awk .
+For programming and for writing this document, I used the
+.I ex-vi
+editor because
+.I ed
+would have been a bit too heavy, even for me.  ;-)
 .P
 The text and heading font is Philipp Poll's \fILinux Libertine\fP.
 The monospace font used for code listings is a TrueType variant of
@@ -45,12 +59,6 @@
 by Hopcroft and Ullman, Addison-Wesley, 1990.
 The title page was inspired by books of the 19th century,
 mainly by the ones of Charles Darwin.
-.P
-For programming and for writing this document, I used the
-.Pn ex-vi
-editor because
-.Pn ed
-would have been a bit too heavy, even for me.  ;-)
 
 .sp 2
 .LP
@@ -62,8 +70,8 @@
 Apart from that, follow the scientific custom:
 Quote and acknowledge the reference.
 
-.sp 2.5c
-.LP
+
+.sp \n(.tu-1u
 Dijkstra's words on page
 .Cf dijkstra.page
 are a quotation of EWD\|648.