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Infrared spectroscopy

On this site
http://www.chemguide.co.uk/analysis/ir/interpret.html#top

it shows an infra red spectrum of ethanoic acid and shows
a very broad trough between 2500 - 3300 cm ^-1 taking this from the point where
the line graph starts to drop it looks more like 2800 - 3800 cm ^-1
do you have to take these measurements from the centre
as it is most accurate . The absorption starts from where the line starts to drop.
why take it from the centre?

Solution Summary

it shows an infra red spectrum of ethanoic acid and shows
a very broad trough between 2500 - 3300 cm ^-1 taking this from the point where
the line graph starts to drop it looks more like 2800 - 3800 cm ^-1
do you have to take these measurements from the centre
as it is most accurate . The absorption starts from where the line starts to drop.
why take it from the centre?

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