Pearson product-moment correlation coefficient (PPMCC) for ROSINA/COPS data for three insolation-driven models for 2.87 AU pre-perihelion in the period 2014-09-01 to 2015-01-01. The three models only differ in the thermal model and surface reflectivity applied. In red, no topographic re-radiation is included and the surface is assumed to be absorbing. In blue, no topographic re-radiation was assumed but the surface was set to be diffusely reflecting. Lastly, in green, topographic re-radiation is included and all surfaces above 130 K are assumed to be diffusely reflecting.