This still was created to for the cover of the journal Science (5 July 2002 issue). It shows epithermal neutron data represented by the colors overlayed on Mars topography. The blue colors represent high concentrations of hydrogen, indicating the strong possibility that water ice exists in those regions.
The vertical exaggeration is 5x normal and the shading exaggeration is 50x normal.
Mars Odyssey epithermal neutron data overlayed on MGS-MOLA topography