Block: SUBROUTINE CALL

Variable	Default format	Use and Comments
BLK_DELTA	6	For subroutines, the delta in the BLOCK_NUM from the first layer.
NUM_LAYERS	6	Total number of layers in the procedure, i.e. the number of times the subroutine will be called.
SUB_NUMBER	6	The subroutine serial number. In GPP2, the SUB_NUMBER can be set to start at any number (not necessarily 1), through a DF2 file parameter.

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