Relative differences between our reference model (Tripathi et al. 1997) for the destruction cross-sections σ_a and the other parameterisations by Letaw et al. (1983), Wellisch & Axen (1996) and Barashenkov & Polanski (1994) are displayed as a function of the nucleus charge, at an energy of 10 GeV/nuc. Each bin is characterised by a given charge Z and encodes the arithmetic mean over the corresponding isotopes. Only the elements involved in the cascade from iron to beryllium are displayed.