[daip] aips

[Unknown]

Dear professor:
     I am an aips software user,I find  your email through the aips
homepage,I have been reducing an EVN data,my aips is 3DE04,when
I do the instrumental phase corrections,my data needs to  select two
scans,just 2 min for each one,and produce two sn table,I use the two sn
table to produce one cl table), I checked the cl table with task
snplt,and I find that the data before the time I selected as the first
scan is lost with an boundary ,some antennas lost the data before the
second scan,I tried to apply one sn table,and the problem is the
same,can you tell me what is the reason here,thank you
   regards
      wu