9. (Advanced) The specific heat depends on the initial sample temperature $T_{s,init}$ (ideally, 100°C), the initial calorimeter temperature $T_{c,init}$ (near 20°C), and the sample and calorimeter final temperature $T_{final}$ (a few degrees warmer than $T_{c,init}$). If all the temperatures are known to the same absolute precision, which temperature uncertainty will have the greatest effect on the specific heat result?