 include |'oleron'|, which is designed specifically for topography. Below I'm using
% my <https://www.mathworks.com/matlabcentral/fileexchange/49065-shadem |shadem|> 
% function to apply relief shading. 

load topo

figure
imagesc(topolonlim,topolatlim,topo) 
axis xy 
cb = colorbar; 
ylabel(cb,'elevation') 

shadem(-11,[225 83]) 
crameri('oleron','pivot') 

%% Citing this colormap: 
% Please acknowledge the free use of these colormaps by citing
% 
% Crameri, F. (2018). Scientific colour-maps. Zenodo. <http: