when running dvips on a dvi (containing just a graph included via an .eps file) the generated ps file "drops" certain characters in the graph (decimal points in the labels on the axes and capital letters in the axis title). Note that the dvi correctly shows the graph in all its details.
However, and this is what puzzling me the output of the dvips command DOES NOT give any error at all. It calls all the correct fonts without any problem.
The fonts called are all CM, and dvips locates them correctly
Any ideas ? Is it possible that certain pfb files are broken without dvips noticing that ?
[Adding that the graph was generated using PyX 0.11 This turned out to be the problem as I note in the comment. a switch to PyX 0.12 solves the issue. I therefore add a PyX tag to this question.]
Here is the dvips output
This is dvips(k) 5.98 Copyright 2009 Radical Eye Software (www.radicaleye.com) ' TeX output 2012.11.07:0003' -> draft2.ps . [1 <./pic/Fig1ext.eps>]

epsfile available for download, and add an example code that reproduces the problem. – Ian Thompson Nov 7 '12 at 19:32