[SAC-HELP] question about rdseed and transfer command

[Arthur Snoke]

Following up on Sheila's response ...

Header variable CONSTANT is not used in the transfer polezero instrument 
correction, and as of RDSEED v5.1 is not put in the header.  There was a 
bug in SAC prior to the just released v101.5 regarding CONSTANT, so best 
to get the new version.  However, there is a bug in RDSEED v5.1 that may 
cause problems working with transfer polezero on some operating systems. 
See <http://www.iris.edu/software/sac/commands/transfer.html> for further 
discussion.

Finally, one should included the FREQLIMITIS argument in the TRANSFER call 
or one gets excessive correction at long periods.  The effect is not as 
bad with a correction to velocity as it is with a correction to 
dislplacement.  The online HELP file discusses this as well.