Thank you roboticus that seems like what I am looking for. Can you give me an example of how to patch up the data, thats where I have been stuck on for some time. Thanks for your help 

# Patch up the data
for (my $i=1; $i < $#table; ++$i) {
   # check surrounding items and patch the data, as needed
   . . .
}

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In reply to Re^2: filling in the zeros...please help by david_lyon
in thread filling in the zeros...please help by david_lyon

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