Observed mass distribution indicated by various symbols with error bars. The lines represent the power-law fitting of mass function φ(M) for M> 1M⊙ of individual XMM-Newton fields E (dashed), C (dot dashed), S (long dashed), and W (dotted), and considering the entire “best sample” (black). The grey line shows the theoretical log-normal curve proposed by Chabrier (2005) with μ = 0.3 and σ = 0.6.
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