I dont see it on my at-office monitor. I'll take a look on the PA-271 when I get home.
If the area is greatly 'pushed' from of lower exposure values / long exposure, you might be seeing an echo of your camera's sensor. Organized noise.
5DIII, 7D, CPS Member
EF 300/2.8 II IS USM, ZE 21/2.8, ZE 50/2 ZE 100/2, TS-E 24/3.5, EF 70-200 f/2.8 IS USM II, EF 24-105 IS f/4, TC 1.4 III, TC 2.0 III