\ref{724182} shows how the maximum temperature varies with the center distance for different heat sink thermal resistances when the power input to the heat sources is fixed at 1W per heat source. As the thermal resistance increases from 0.1K/W to 30K/W, the maximum temperature of the module increases as expected. As heat flows from the hotter body to the colder body, TMAX  is always at the center of the heat source. As we increase the thermal resistance, the heat sink resists the flow of heat to the base and hence resists cooling. Due to this, the time is taken to reach thermal equilibrium increases and heat flows laterally. This effect can be seen by comparing Error! Reference source  not found. and Error! Reference  source not found.. This results in an increased thermal crossover effect. Comparing Error! Reference  source not found. and Error! Reference  source not found., we can see that as we increase the distance from 1.1mm to 14mm, the maximum temperature falls less rapidly as compared to the temperature at the center. The temperature at the center is affected by all  4 heat sources, and as we increase their separation, the effect decreases that show a significant decrease in the thermal crossover effect. An exponential temperature decrease (sharper negative gradient) from x = 1.1mm to x between  4mm and 5mm shows that decreasing the distance beyond x =  4mm causes a sharp increase in the thermal crossover effect as shown by the rising temperature. Thus, 4mm or 5mm might be the optimum center separation for minimum thermal crossover.