The file 'AinslieLeighton2016_fig3a_data.txt' contains the data plotted in Figure 3a of Ainslie & Leighton (2016) 'Sonar equations for planetary exploration', J Acoust Soc Am, 
DOI: 10.1121/1.4960786

Figure 3a is a graph of y vs x, where

x = molecular mass, m, in yottograms (yg) for the following gases [see figure legend for the full list of gases]
row 1 = He
row 2 = Ne 
row 3 = Ar
...
row 11 = CO2

y = thermal noise coefficient, \mu, in yottograms (yg) for each gas

\mu / yg	 m / yg		Gas (see Fig 3a legend)
6.695000 	 50.479111 	He
33.776275 	 254.667114 	Ne
66.866313 	 504.160119 	Ar
... 
73.661738 	 694.245520 	CO2