Hello, I'm looking to perform some statistical analysis on some idealised data cases, and was wondering if someone could point me in the direction of how to create a simple dipole field within R? I basically require a rectangular grid with a distinct high/low pressure dipole. Any pointers appreciated, thank you! Laura Quinn Institute of Atmospheric Science School of Earth and Environment University of Leeds Leeds LS2 9JT tel: +44 113 343 1596 fax: +44 113 343 6716 mail: laura at env.leeds.ac.uk