Hi José, Those are the cell centers. They seem to span the whole domain, but I think that is because you need to divide by the conversion factors instead of multiplying by them. So for instance, 450/pf["cm"] -Matt On Jul 26, 2013 5:50 PM, "José Utreras" <jutreras@das.uchile.cl> wrote:

After defining a disk

my_disk=pf.h.disk(sc, [0,0,1], 450.0*pc, 30.0*pc)

I asked for the minimum and maximum values of these fields

xmin= my_disk["x"].min() xmax= my_disk["x"].max() ymin= my_disk["y"].min() ymax= my_disk["y"].max() zmin=my_disk["z"].min() zmax=my_disk["z"].max() print xmin,xmax,ymin,ymax,zmin,zmax

and got

0.00390625 0.99609375 0.00390625 0.99609375 0.00390625 0.99609375 xmin+xmax=ymin+ymax=zmin+zmax=1

So I really don't know what actually are these fields

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