Radiative loss functions considered in this work. Solid line: power-law segments function, equal to T2 (for log T < 4.95 K) and T-1 (for log T > 4.95 K); solid line plus star symbols: a peak mimicking the H Ly-α losses was added to the previous function; dashed line: from Cook et al. (1989), but with a T3 dependence below T = 105 K; long-dashed line: from Colgan et al. (2008); dotted line: from Dere et al. (2009); dot-dashed line: from Dere et al. (2009) without the H contribution.
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