"Gianna Stefani" wrote in message
...
"Martin Rowley" wrote in
message
...


Thanks for your help - I shall persevere.


.... it's probably worth saying as well, don't get too 'hung up' on the
absolute value! Obviously today is an interesting situation, but for
most purposes, your unit sounds as if it is giving a reasonable idea of
the 'ups and downs' in the pressure field, and it is these, particularly
the rate of change over 3, 6, 12 and 24hr that are important, rather
than the value itself.

Martin.

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