Xc, Yc, Zc respectively. Xp in the direction at1 to at2, and with the vertical axis Yp as near as possible to direction at3 to at4. Note that all four atoms must be given. At least 3 atoms must be given, with the upper limit only defined by the number of labels possible to fit on the command line. XROT, YROT, ZROT allow the user to modify any of the above view directions, by applying successive rotations about the Xp, Yp, Zp axes.
Positive angles produce a clockwise rotation of the image.
The presence of these keywords will always modify whatever current view direction has been set, so the effect can be cumulative. VIEW YO XROT 45 will select the view along Yo and then rotate 45 degrees about the horizontal axis Xp. If no value of n is given then the previous value of n is used. If no value of n was given earlier a default of 30 degrees is used. Positive angles cause a clockwise rotation of the image.