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			       BT
			 BACKWARD TRANSFORM
	Use REAL and COMPLEX files as storage registers to contain
	your results  ie.
	
	OPTION		MAP		REAL		COMP
	BT		3		S*T		S(x)*T(x)

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 TYPE OPTIE                              22-OCT-1981 04:23:50.06
 >>>.BT                                                                             
 OPTION .BT
 NPTS=512
 OPEN INPUT FILE WITH COMPLEX DATA
 FILIC=COFT			! See CR.DOC where this was created.
 There are   3 maps in the file       
 Reading from the file
   76 rows of  512 pixels in C8 format
 MAPIC=2
 ROWI=1:76
 MAPOC=3
 OPEN OUTPUT FILE FOR REAL TRANSFORM
 FILOR=REFT
 There are   3 maps in the file       
 Reading from the file
   76 rows of  512 pixels in R4 format
 MAPOR=3

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