I have been following code from a textbook which creates the following plot for fluid pressure in the earths crust. It is good to be able to see the general distribution of pressure. My question is, if I wanted to know the precise pressure at a specific point, rather than approximating based on the colour, where would I be able to find such data? It is hard to precisely equate the colour chart to an exact value especially when one is colourblind. For example, say I wanted to know if the exact pressure at (25km, -10km) is 61Mpa or 63Mpa.
The code that creates the plot is shown below.
um = mean(u);
vm = mean(v);
title(['Excess fluid pressure (MPa) after ',num2str(time/seconds_per_yr),' years'])
Thank you kindly