File:1.9 lighting curves (gamma=0).png

Summary
Assuming I didn't miss anything, these should be the lighting curves for the Overworld, Nether, and End, during the daytime, with brightness set to "moody". Horizontal axis is block light, vertical is sky light. The curve for the End does not seem to be a bug, it really doesn't take sky lighting into account (which can also be seen by the fact that lightning doesn't light things up in the End, assuming you avoid it creating fires).

These curves were calculated using the code from MCP 9.24 (Minecraft 1.9), looking at the calculations done in,  , and   and writing code to perform equivalent mathematical operations.

Considering the file consists of simple text and images generated from mathematical formulas, I'm going to mark it as "public domain".