We are working with your FERRET Tool 4.91, and we need define points grid on an irregular grid: latitude limits are 30,26,22,18,14,10,6,2,-2,-6,-10,-14,18, -22 and -26 the question is: how we define this grid using FERRET? Thanks in advance. Manuel Gonzalez Gomez and Tomas Morales Acoltzi Centro de Ciencias de la Atmosfera Universidad Nacional Autonoma de Mexico