Ratio of the difference between the temperature values obtained neglecting the soft proton component (T_NOSP) and the one of our pipeline (T_SP, including a SP component) over T_SP in percent units, as a function of the SOU/BKG ratio in the spectral region. Filled points show the individual measurements (error bars not shown for clarity), while the open squares represent the weighted mean ratio and its error in different intervals of SOU/BKG. Blue points refer to measurements in observations with a significant residual contamination (inFOV − outFOV > 0.04 cts s⁻¹), red are for observations with a low contamination. The magenta triangles shows the median value for clusters with low contamination, when the median is significantly different from the mean.