I have a contour plot (fig 1), plotted according to [M,h]=contourf(f,8). With this I slice contour #8. Thus, I expect to have in matrix M all (x,y) coordinates of the 8th contour. These coordinates have (logically) not to exceed the xmax/ymax (250/250). Instead, when I plot matrix M i have some values that larger then xmax/ymax (figure 2). According to the documentation (https://de.mathworks.com/help/matlab/ref/contour.html#mw_27139ced-212f-437f-abab-0ff7c175e33b),
the first pair of data is the Level and the number of Vertices. But plotting the contour(f,8) in Fig1 I should have only first pair of data in returned M which describe the leve 8 l!!!
Please explain their origin of larger data.
Figure 2 (Plotted M)