Apr-May-Jun-Jul-Aug    from 4cm to 7cm

Feb-Mar-Apr    from 4 cm to 7 cm

May-Jun-Jul-Aug-Sept    40mm to 60mm - 60mm to 80mm - 80mm to 100mm

May-Jun-Jul-Aug-Sept-Oct    40mm to 60mm - 60mm to 80mm - 80mm to 100mm