where the parameters are: MINX = the minimum value of the x coordinate; MAXX= the maximum value of the
x coordinate. Similarly, for the y coordinates we have: MINY= and MAXY=. Another parameter of this macro
is the size of the square drawn given by DIM= (for instance, if DIM= 20, 202 = 400 squares will be created).
Finally, the last two parameters, ANNO= and PRINTN = YES, indicate the dataset with the location of samples
and whether the numbering of each square will be printed using the command YES(Figure 5 (a)) or NO (Figure 5
(b)), respectively.