Temperature as a function of cometary depth for the orbital position corresponding to early August 2015. The Model B slow rotator at two primordial temperatures is tested: 20 K (dashed lines) and 30 K (solid lines). Results are shown for three thermal inertia values 10 (thin), 30 (normal), and 90 J m^-2 K^-1 s^0.5 (bold) lines. Generally, the higher the thermal inertia the deeper the orbital heat wave penetrates (see Sect. 3.2 for further description).