In the basic estimation method, lower L and upper U channels define the region of the peak and a straight line between them defines the background under the peak.

In an alternative estimation method the background is estimated by selecting a number of bins (m) on either side of the peak.

Another estimate for the background is using m channels either side of the peak.

Toggle bar to choose the method and in the alternative method, vary the value of m.

Note that if m is too large the background regions include part of a neighbouring peak and the net peak count is incorrect.