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+#
+# Makefile -- torus homology
+#
+# (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
+#
+all: torus.jpg
+
+torus.inc: torus.m
+ octave torus.m
+
+torus.png: torus.pov torus.inc
+ povray +A0.1 -W1920 -H1080 -Otorus.png torus.pov
+
+torus.jpg: torus.png Makefile
+ convert -extract 1624x970+150+78 torus.png torus.jpg