Flags LOGDFL and PRLOGD

The flag LOGDFL should be set If LOGDFL is .FALSE., then RENDLD is set equal to RSTART.

Since the width of the first interval in the Airy propagation is equal to SPAC x FSTFAC, even if LOGDFL is set .FALSE., SPAC should be given a non-zero value.

If the flag PRLOGD is set .TRUE., then the log-derivative matrix is printed out after both the Logd and Airy propagation steps. Also the K matrix is printed out prior to the determination of the S matrix.

Do not set AIRYFL and LOGDFL both .FALSE.

See also the SPAC and RSTART help files.
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