This plot shows the x-position of the optical axis derived from the
irdis distortion recipe.
Optical axis x-positions of the right beam refer to the right beam product extension with
size 1024x1024 pixel covering the pixel area x=[1025,2048], y=[1,1024] of the raw frame.
This plot is provisional, as the irdis distortion recipe is not yet fully operational.
The pinhole distance is about 14 pixels.