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Histogram Parameters
fwhm
Full Width at Half Maximum
Definition:
Determines the width of the largest area peak, measured between bins on either side of the
highest bin in the peak that have a population of half the highes
have an area equal to the maximum population, the leftmost peak is used in the computation.
Description:
First, the highest population peak is identified and the height of its highest bin (population)
determined (for a discussion on how peaks are determined see the pks parameter Description
Next, the populations of bins to the right and left are found, until a bin on each side is found to
have a popul
from the center point of the first bin below the 50% population to that
the highest bin. The intersection points of these lines with the 50% he
determined. The length of a line connecting the intersection points is
E
xample:
fwxx
Full Width at xx% Maximum
Definition:
Determines the width of the largest area peak, measured between bins on either side of the
highest bin in the peak that have a population of xx% of the highest's population. If several peaks
have an area equal to the maximum population, the leftmost peak is used in the computation.
Description:
First, the highest population peak is identified and the height of its highest bin (population)
determined (see the pks description). Next, the bin populations to the right and left are found until
a bin on each side is found to have a population of less than xx% of that of the highest bin. A line
is calculated on each side, from the center point of the first bin below the 50% population to that
of the adjacent bin, towards the highest bin. The intersection points of these lines with the xx%
height value is then determined. The length of a line connecting the intersection points is the
value for fwxx.
Example:
fwxx with threshold set to 35%:
90
ERIES
ation of less than 50% of that of the highest bin's. A line is calculated on each side,
t's population. If several peaks
of the adjacent bin, towards
ight value is then
the value for fwhm.
WRXi-OM-E Rev C
:).
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