OurgNFW (parametric) pressure profile as simultaneously fit to the non-parametric pressure profiles is shown in red. The error bars are statistical, from the MCMC fits. The residual significances (σ, lower panel) are calculated from the asymmetric statistical errors (Table 2) and calibration errors. The non-parametric symbol-to-instrument association remains the same as in Figs. 2 and 3. The MUSTANG point that falls well (~ − 2.8σ) below the gNFW pressure profile (close to 0.1 R₅₀₀) is of note and discussed in Sect. 6. The last two NIKA points fall − 5.5σ and − 2.8σ below the gNFW profile.