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"zoom" scales and translates the window and the origin to cover the atom selection.
zoom [ selection [,buffer [, state [, complete ]]]]
zoom zoom complete=1 zoom (chain A) zoom 142/
cmd.zoom( string selection, float buffer=0.0, int state=0, int complete=0 )
state = 0 (default) use all coordinate states state = -1 use only coordinates for the current state state > 0 use coordinates for a specific state complete = 0 or 1: Normally the zoom command tries to guess an optimal zoom level for visualization, balancing closeness against occasional clipping of atoms out of the field of view. You can change this behavior by setting the complete option to 1, which will guarantee that the atom positions for the entire selection will fit in the field of an orthoscopic view. To absolutely prevent clipping, you may also need to add a buffer (typically 2 A) to account for the perpective transformation and for graphical representations which extend beyond the atom coordinates..