I am measuring the redoxpotential in marine sediments (tidalflats) with a multielectrode system. The result is a datafield of 365 points in a sediment block of 30*30*30 cm. Dicer is great to find structures in this block. Ulf Eversberg Bremerhaven/Germany 2:241/200.24 ulfe at columbus.clipper.de ulfe at fishtwn2.han.de