MODIFY POSITION

        LAS\MODIFY POSITION Lambda Beta

    Change the central position for the  source  to  (lambda_0,beta_0).  The
    offsets  are also modified, as to be consistent with the new central po-
    sition. This command is usefull when different parts of one  source  are
    mapped relative to several reference positions. Only RADIO projection is
    handled.

    If the coordinate system is EQuatorial:
          lambda = lambda_0 x 12 /pi
          beta   = beta_0   x 180/pi
    If the coordinate system is GALactic:
          lambda = lambda_0 x 180/pi
          beta   = beta_0   x 180/pi