Could this be a small mistake?

[HelenXR]

in AngleToConfig.md file :

-verify_angles xx xy yx yy max_degrees tests each mesh point to ensure that the change between the vectors point to each of its neighbors in angle space, when transformed into screen space, does not differ by more than max_degrees. The transformation is specified: The vector (xx, xy) points in screen space in the direction of +longitude (left). The vector (yx, yy) points in screen space in the direction of +latitude (up).

"direction of +longitude (left)" may be is "direction of +longitude (right)" ?

[russell-taylor]

Thanks for catching that. Fixed in d7e697a and an upcoming book chapter.