“…These measurements can be done using either the whole continuum of X-rays provided by the accelerator (Bordas & Randall, 1978 and references therein) or a monochromatic beam extracted from this continuum (e.g. Barrington-Leigh & Rosenbaum, 1976;Haselgrove, Faruqi, Huxley & Arndt, 1977;Phillips, Wlodawer, Goodfellow, Watenpaugh, Sieker, Jensen & Hodgson, 1977;Tchoubar, Rousseaux, Pons & Lemonnier, 1978;Holmes & Rosenbaum, 1979).…”