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This shows the three principal bands of underside hindwing markings, basal, discal, and marginal. The v numbers refer to the veins and the s numbers refer to the spaces between the veins.
The marks are referred to as "discal s2" etc, except for discal s4/5 and basal s4/5 where the mark extends over two spaces, and marginal v5 where the mark straddles vein 5, extending halfway into both spaces s4 and s5.