We fit a functional form for a universal ICM entropy profile to the scaledentropy profiles of a catalogue of X-ray galaxy cluster outskirts results,which are all relaxed cool core clusters at redshift below 0.25. We alsoinvestigate the functional form suggested by Lapi et al. and Cavaliere et al.for the behaviour of the entropy profile in the outskirts and find it to fitthe data well outside 0.3r200 . We highlight the discrepancy in the entropyprofile behaviour in the outskirts between observations and the numericalsimulations of Burns et al., and show that the entropy profile flattening dueto gas clumping calculated by Nagai & Lau is insufficient to matchobservations, suggesting that gas clumping alone cannot be responsible for allof the entropy profile flattening in the cluster outskirts. The entropyprofiles found with Suzaku are found to be consistent with ROSAT, XMM-Newtonand Planck results.
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