PSWITCH

 

           PSWITCH Off1 Off2 [System] [/TIME T] [/SYMMETRIC] [/NOSYM]
      Select a position-switched observation.  The  reference  position
 (off-position)  is  offset  by  (off1,off2)  from the source position.
 Current angle units are used.  The System argument  can  be  given  to
 indicate  the  coordinate  system used for the off-position and can be
 BASIS or HORIZONTAL; if not present,  the  default  coordinate  system
 defined  by  SET OFFSET is used.  The subscan length T (= on = off, in
 seconds) may be also specified using the /TIME T  option  (default  30
 sec).
      The /SYMMETRIC option does a  symmetric  position-switched  scan,
 that  is  OFF-ON-ON-OFF  series  of  subscans.  The number of subscans
 (selected by the SET SUBSCAN command) should therefore be  a  multiple
 of 4.
      The  /NOSYM  option  gets  back  to  the  default  mode  i.e.   a
 OFF-ON-OFF-ON...  sequence.
      Note:  switching in HORIZONTAL mode may decrease the intensity of
 baseline ripples.