Observed and synthetic spectra. Left: spectrum observed by RESIK (full line) together with a synthetic isothermal Maxwellian spectrum (dash-dotted line) with log(T/K) = 7.01. Middle: synthetic spectrum for the composed np-distribution with n = 1, p = 2.1, a/b = 20, and log(τ/K) = 7.0 and the Maxwellian spectrum with the same log(T/K) = 7.0. Right: synthetic spectrum for the composed np-distribution with n = 11, p = 2.1, a/b = 20, and log(τ/K) = 7.1 compared to the Maxwellian spectrum with log(T/K) = 7.02.