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Defining T axis from data



Hi all,

I'm trying to import a time series from an ASCII file
and would like to understand what ferret is doing when
I define the T axis from data in the file.
----------------------------
The data:
test.dat
2002 6 1 0 0  3.09 
2002 6 1 0 10 3.23
2002 6 1 0 20 3.83
2002 6 1 0 30 3.91
2002 6 1 0 40 3.46
2002 6 1 0 50 3.31
2002 6 1 1 0  3.46
2002 6 1 1 10 3.38

--------------------------------
The script:
 ! Version 5.22 - 07/27/00
 ! test.jnl

file/var=yy,mm,dd,hh,mi,-/skip=1 test.dat
let tref = days1900(yy,mm,dd)*24*60 + hh*60 + mi
def ax/t/from_data/name=tr/units=min/t0="1-jan-1900 00:00" tref
def gr/t=tr gt
file/var=yy,mm,dd,hh,mi,val/grid=gt/skip=1 test.dat
list/l=1:5/noh mm,dd,hh,mi,val

---------------------------------
Output:
yes? go test
01-JUN-2002 00:00:00 / 1:  6.000  1.000  0.0000   0.00  3.090
01-JUN-2002 00:08:00 / 2:  6.000  1.000  0.0000  10.00  3.230
01-JUN-2002 00:20:00 / 3:  6.000  1.000  0.0000  20.00  3.830
01-JUN-2002 00:32:00 / 4:  6.000  1.000  0.0000  30.00  3.910
01-JUN-2002 00:40:00 / 5:  6.000  1.000  0.0000  40.00  3.460

What's the reason for the 2 min offset at 00:08:00 and 00:32:00 ?

Regards,

Paulo


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