You're welcome !
Sorry I don't have any further comments to offer
Hang around awhile for better insights from others
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Rgds
Max
xl 97
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GMT+8, 1° 22' N 103° 45' E
xdemechanik <atyahoo<dotcom
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"Dr. Sachin Wagh" wrote in message
...
Thanx a ton Max,

The graph represents a straight line decline; what I had earlier thought
that this might lead to a parabolic curve
.
. .
. .
Any comments

Regards

Sachin