The epidermis of a leaf is removed from a leaf and sections of the epidermis incubated in different concentrations of mannitol (asugar alcohol that does not enter plant cells). In .1M mannitol the epidermal cells neither gain nor lose weight. Sections of the epidermis placed in .6M mannitol become flaccid although although they do not change volume. From this information, calculate the original water potential, osmotic potential and pressure potential of the epidermal cells.