The nodegraph for ramp4 is incorrect

[numega]

According to the supplemental spec, a texcoord value of (0, 0) should return the bottom left value. However, the current graph will return the top left value. I think that the arguments to the last mix node should be reversed.

[jstone-lucasfilm]

Good observation, @numega, and feel free to post a fix if your team has the bandwidth and necessary approvals.