Left: distribution of relative temperature difference found by Ga10 and the FOSC. Right: distribution of relative temperature difference between SG12 and the FOSC using the same temperature calibration. Each plot corresponds to a subsample selected by spectral class as determined by the FOSC and labelled on the plot. The vertical red dotted line shows the median value and the black dashed lines give the value of the 15th and 85th percentiles.