sds_id	IN:	Data set identifier returned by SDcreate or SDselect
	cal	IN:	Calibration factor
	cal_err	IN:	Calibration error
	offset	IN:	Uncalibrated offset
	offset_err	IN:	Uncalibrated offset error
	data_type	IN:	Data type of uncalibrated data

	Purpose	Sets the calibration information.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	SDsetcal stores the calibration record associated with a data set. A calibration record contains the following information:

cal	Calibration factor
cal_err	Calibration error
offset	Uncalibrated offset
offset_err	Uncalibrated offset error
data_type	Data type of uncalibrated data

		The relationship between a value cal_value stored in a data set and the original value is defined as: orig_value = cal * (cal_value - offset).
		The variable offset_err contains a potential error of offset, and cal_err contains a potential error of cal. Currently the calibration record is provided for information only. The SD interface performs no operations on the data based on the calibration tag.
		The calibration information is automatically cleared after a call to SDreaddata or SDwritedata. Therefore, SDsetcal must be called once for each data set that is to be read or written.

	FORTRAN	integer function sfscal(sds_id, cal, cal_err, offset, offset_err, data_type)
		integer sds_id, data_type
		real*8 cal, cal_err, offset, offset_err