# What function I'm looking at?

1. Apr 15, 2015

### guest1234

Hey all

What's could the function be on the plot (see the attachment)?

2. Apr 15, 2015

### Staff: Mentor

I know! I know! Pick me!

Where did you get it, and what do you think it is?

3. Apr 15, 2015

### guest1234

For some reason your response led me to think that the answer is obvious... 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 ..
As for the irrelevant 'where did you get it' -- it's thermally averaged cross section.

4. Apr 15, 2015