The salary distribution isn't even sourced. It was probably pulled from a source like salary.com which provides curves that look nearly identical to the one sho

The salary distribution isn't even sourced. It was probably pulled from a source like salary.com which provides curves that look nearly identical to the one shown in the offer letter. I don't think there are similar sources for more complex distributions (option payouts over all valuations). It looks like the exit chart is designed to show what happens on the lower end of valuations (ie. as a lowly employee you don't participate). Also note that the X axis is serverely distorted: it ranges from $0-$100,000,000, but half the space is taken up by a blow up of a range of just $7,000,000! Further still, the information on that page is not consistent. The chart refers to $2.35 options, but you are apparently granted $2.38 options. The option payout calculator also doesn't appear to account for your costs to exercise your options either?