How to see values in heatmap when we use subplot

I have heatmap like this

subplot(2,2,1);
a=rand(9);
k=heatmap(a);

subplot(2,2,2);
a=rand(9);
k=heatmap(a);

subplot(2,2,3);
a=rand(9);
k=heatmap(a);

I want to see values of each box in the plot.

Answer 1

[Chunru]

Either increase the figure size or reduce the font size, or both:

figure('Position', [0 0 1024 768]);
subplot(2,2,1);
a=rand(9);
k=heatmap(a);
k.FontSize =2;