Comparison of the biases obtained in Sect. 2.2 with values from the literature. Two values for a single study indicate that it is subject to the X-ray temperature calibration differences. A dark blue diamond corresponds to a Chandra bias and a red diamond to an XMM-Newton bias. The crosses indicate Chandra-like or XMM-like biases, i.e. biases rescaled to the expected value with data from the other instrument. The light blue points correspond to analyses insensitive to the X-ray temperature calibration problem, with a diamond indicating an observational value and a dot indicating a value derived from simulations.