Colorbar appears to contain some unwanted values

HoloViews
1

my colorbar_opts is :

{'major_label_overrides': {0: '160-180', 1: '180-953', 2: '953-1726', 3: '1726-2500'}, 'height': 400}

On display, colorbar appears to contain some unwanted values like 0.5,1.5,2.5.
How can I hide them ?

regards