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* ''P'' = corrected shut-in pressure
* ''P'' = corrected shut-in pressure
* ''C'' = pressure gradient constant (0.433 psi/ft or 0.1 kg/cm<sup>2</sup>/m)
* ''C'' = pressure gradient constant (0.433 psi/ft or 0.1 kg/cm<sup>2</sup>/m)
* ''ρ''<sub>''w''</sub> = specific gravity of water
* ''ρ''<sub>''w''</sub> = specific [[gravity]] of water
* ''E''<sub>m</sub> = elevation of pressure measurement
* ''E''<sub>m</sub> = elevation of pressure measurement
* ''E''<sub>r</sub> = reference elevation (not subsurface depth)
* ''E''<sub>r</sub> = reference elevation (not subsurface depth)