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short communications
In Hart & Rodrigues [J. Appl. Cryst. (1978), 11, 248–253] equation (6) should read Ip(m + n)h(α) = ∫∞−∞ Πl = m + n − 1l = 0 R⊥ph(θ − lα)dθ + ∫∞−∞Πl = m + n − 1l = 0 R||ph(θ − lα)dθ. The equation given is correct for the double reflection case and therefore the error does not propagate in the paper.