How to visualize Umatrix in SOM?

Hi, I am learning SOM for Umatrix representation. When I plot Umatrix, I am getting reverse representation of it. Higher color values showing Class and Lower values are showing boundary. I want to make it reverse. I am attaching the figure, where the higher values in colorbar representing separate class and dark blue is showing separation between classes. I want to get reverse, so that lower values will show class.

D=data;

D1 = som_normalize(D, 'range');

smI=som_lininit(D1, 'msize',[17 17], 'lattice', 'rect', 'shape', 'sheet');

smR=som_batchtrain(smI, D, 'radius',[7 2], 'trainlen',2500, 'neigh', 'gaussian');

sMap=som_batchtrain(smR, D1, 'radius',[2 2], 'trainlen', 1500, 'neigh', 'gaussian');

colormap(jet)

caxis([1 5])

Y=som_show(sMap, 'umat', 'all');

X=flipud(Y);

M=sMap.codebook;

Is there anybody can help me fix this?