NRW should reflect this by reporting a feasible range, giving high and low values for the top and bottom of the range as well as the value considered most likely.
Dylai CNC adlewyrchu hyn trwy gofnodi ystod ddichonadwy, gan nodi gwerthoedd uchel ac isel ar gyfer brig a gwaelod yr ystod, yn ogystal â nodi’r gwerth a gaiff ei ystyried fel y gwerth mwyaf tebygol.