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ArcInfo GRID's RECLASS function only reclassifies integer grids. Use this trick to reclassify your floating point grid. Be aware that some values may be rounded.
<multiplier> = 10^(# of decimals to keep + 1)
1000 = 10^3 = 10^(2 + 1)
Grid: SETWINDOW dem
Grid: SETCELL dem
Grid: demx1000 = dem * 1000
Grid: demrcls = RECLASS(demx1000,demx1000.rmp)
You will need to modify values in the reclass table to reflect the new grid values.
Grid: demfinal = demrcls / 1000