cell_list.RdA list with the coordinate data to plot the other organisms .
cell_listA list with 340 elements columns, each of which are
a data.frame with 6 columns:
coordinates in x-dimension
coordinates in y-dimension
identifier of the region
coordinates in x-dimension, duplicated for ease of use
coordinates in x-dimension, duplicated for ease of use
polygon group to avoid linkage between polygons