Contour plots of the measurements of diameter versus elements of C. leptoporus per site and sample
(Click and drag a file onto your harddrive)
Contour construction:
Contoured frequency plots of specimens in the diameter versus
elements space for each sample at Site 251 and 251A. Frequencies
indicate the number of specimens per grid cell spanning an area
of 1µm x 2 elements. Shaded areas indicate the total coverage
of all specimens (i.e. frequency of specimens > 0). Contour
intervals are 3 specimens per grid cell (thin lines). Thick contour
lines indicate 2 specimens per grid cell (same contour line as
in Figures 9 and 10 in the article). The letter n indicates the
total numer of specimens included in a sample.
For mode recognition the following algorithm was applied to all
gridded data: A frequency maximum at cell Zm was found when the
following criterium for neighbouring grid cells Zj was met (Z
represents the number of specimens per grid cell, m is an index
for the cells with a frequency maximum, and j numbers the neighbouring
cells from 1 to 8):
Zm - Zj > 0, for all j = 1 to 8
A mode was considered significant, when Zm - Zmean > 1, with Zmean being the mean of the frequencies Zj from the eight surrounding cells. This condition was chosen arbitrarily, but several tests have demonstrated, that this criterion reasonably separated significant maxima from insignificant ones.