where does the IPA_Glass.png spectrum come from?

[r4mp]

Hi @mariobehling,

Currently I'm trying to understand how the analyse.py works (and the math behind it).
But a piece of the puzzle is missing... where does the IPA_Glass.png spectrum come from? What kind of liquid was spectroscopy used as a reference?

Or is the reference just the sun or LED spectrum (through the cuvette with just the isopropanol or aceton, which was used for the extraction, in it) which was also used as light source for the sample spectrums?

Thx in advance,
r4mp aka Gerrit