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point_lun is slow


reading from a data file at regularly spaced byte locations, 2 bytes at
a time using point_lun - my program is abnormally slow.  i don't have
enough experience to guess whether the poor performance is inherent to
point_lun & readu approach or if there are options which are affecting
execution adversely.  

i'ld appreciate any thoughts on the topic which might lead to a

thank you, 

george mccabe, gmccabe@replica.gsfc.nasa.gov