Issue I552 [contours,bug,resolved] Small anomaly in gradient contours for maximum positive z in 3D arrays. There is a small anomoly in gradient contors at the maximum positive Z coordinate in 3D arrays. This is probably not normally noticeable, but if you create a (very small) 3x3x3 gu array with potential(z) = z and plot gradient contours, it is noticible at z=2. Affects 7.0.0-8.0.6-TEST6. Resolved in 8.0.6-TEST7.