(53)In order to reflect empirical evidence on natural catastrophes in the calibration of the standard formula, the modelling of natural catastrophe risk should be based on geographical divisions that are sufficiently homogeneous in relation to the risk that insurance and reinsurance undertakings are exposed to. The risk weights for those divisions should be specified in such a way that they capture the ratio of annual loss and sum insured for the relevant lines of business using a Value-at-Risk measure with a 99,5 % confidence level. The correlation coefficients between those geographical divisions should be selected in such a way that they reflect the dependency between the relevant risks in the geographical divisions, taking into account any non-linearity of the dependence.