Fig. 11From: Artificial weathering of rock types bearing petroglyphs from Murujuga, Western AustraliaPercentage change of different element concentrations on the sample of surface varnish with artificial weathering time. Least-squares regression lines are shown with the 95% confidence limit that is marked by coloured fields. The Fe and Mn data from the granophyre scatter erratically and are therefore not fitted with a functionBack to article page