menas that p.1 was different in the two runs, but only slightly (about 0.2 dB). Here another example with a slightly larger dB difference:
Could it be because of the differences between lm-math and cm-math fonts?
Good thought. I'm pretty sure you're right. Here's one of the 5dB differences. Each pdf file uses five fonts, and the two fonts that vary between the files are the math ones: $ pdffonts tex/context/base/core-mat.tex/test-001-20070112.pdf > 1 $ pdffonts tex/context/base/core-mat.tex/test-001-20070123.pdf > 2 $ diff -U0 1 2 --- 1 2007-02-05 21:29:55.000000000 -0500 +++ 2 2007-02-05 21:29:55.000000000 -0500 @@ -4 +4 @@ -XXFRMY+CMMI12 Type 1 yes yes yes 5 0 +URGTRZ+LMMathItalic12-Italic Type 1 yes yes yes 5 0 @@ -7 +7 @@ -FXXUVH+CMSY10 Type 1 yes yes yes 8 0 +DOUOBX+LMMathSymbols10-Italic Type 1 yes yes yes 8 0 -Sanjoy `Not all those who wander are lost.' (J.R.R. Tolkien)