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diff --git a/buch/papers/kugel/images/Makefile b/buch/papers/kugel/images/Makefile
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+#
+# Makefile -- build images
+#
+# (c) 2022 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
+#
+all: curvature.jpg spherecurve.jpg
+
+curvature.inc:	curvgraph.m
+	octave curvgraph.m
+
+curvature.png:	curvature.pov curvature.inc
+	povray +A0.1 +W1920 +H1080 +Ocurvature.png curvature.pov
+
+curvature.jpg:	curvature.png
+	convert curvature.png -density 300 -units PixelsPerInch curvature.jpg
+
+spherecurve2.inc:	spherecurve.m
+	octave spherecurve.m
+
+spherecurve.png:	spherecurve.pov spherecurve.inc
+	povray +A0.1 +W1080 +H1080 +Ospherecurve.png spherecurve.pov
+
+spherecurve.jpg:	spherecurve.png
+	convert spherecurve.png -density 300 -units PixelsPerInch spherecurve.jpg
+
+spherecurve:	spherecurve.cpp
+	g++ -o spherecurve -g -Wall -O spherecurve.cpp
+
+spherecurve.inc:	spherecurve
+	./spherecurve