The plot in question is identified as representing a transfer function, specifically resembling a second-order high-pass filter. One participant suggests that the function is 1-e^{-x}, which aligns with their observations of an exponential decay in a log-log scale. There is a discussion about the vertical axis labeling, questioning why the logarithmic lines increase by a factor of 100 instead of 10, indicating potential confusion or error in the plot's presentation. The context of the plot relates to a thermally averaged cross section, which adds to the technical nature of the discussion. Overall, the conversation centers around identifying the characteristics and implications of the transfer function depicted in the plot.
So I plotted 1-e^{-x} and it turns out that it's the answer I'm looking for. Never seen an (inverse or whatever it's called) exponential decay plot in log-log scale before ..