Conclusions

Melas Chasma
Not Measureable

Eos Chasma
Rough, but acceptable (tied with Gusev)
Gusev Crater
Rough, but acceptable (tied with Eos)	

Hematite Area
Albedo is contributing to measurements, slopes are probably
    much lower than reported here.

Isisdis Planitia
Low roughness (currently suffers from undersampling).
Athabasca
Also very low roughness