The most reliable data on the chemical composition of Pluto’s atmosphere is this. It’s clear from this that Pluto’s atmosphere contains molecular nitrogen, methane, ethene and ethyne (acetylene). Can you calculate/estimate from this graph what percentage of each?

The full article that the figure is drawn from is http://blogs.nasa.gov/pluto/2015/10/30/in-the-shadows-of-pluto-and-charon/

mollwollfumble said:

The most reliable data on the chemical composition of Pluto’s atmosphere is this. It’s clear from this that Pluto’s atmosphere contains molecular nitrogen, methane, ethene and ethyne (acetylene). Can you calculate/estimate from this graph what percentage of each?

The full article that the figure is drawn from is http://blogs.nasa.gov/pluto/2015/10/30/in-the-shadows-of-pluto-and-charon/

Looks like it’s set to a quarter each from nitrogen, methane, ethene and ethyne (acetylene). But that would mean that each of the individual molecule spectra displayed is modified to a different atmospheric density.