Sorry, scratch this phrase:

The "25" is the height param in the OFFSET, so you could adjust this to
say:
50 if the interval was 50 instead

Just adjust all the "25"s in the formula to say: 50
if the interval was 50 instead

--
Rgds
Max
xl 97
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GMT+8, 1° 22' N 103° 45' E
xdemechanik <atyahoo<dotcom
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