If no, the following parameters are used to supply the values of N1 and N2 for the output images. The x co-ordinate of the center of the ellipse describing the solar image. N1 is the first dimension of the image.
Units are pixels.
The y co-ordinate of the center of the ellipse describing the solar image. N2 is the second dimension of the image. Units are pixels. The semi-minor axis of the ellipse descibing the solar image. N1,N2 are the dimensions of the image.