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* Δ''p''<sub>lhr</sub> = pressure change in first hour of test (psi)
* Δ''p''<sub>lhr</sub> = pressure change in first hour of test (psi)
* ''ϕ'' = [[porosity]] (fraction)
* ''ϕ'' = [[porosity]] (fraction)
* ''μ'' = viscosity (cp)
* ''μ'' = [[viscosity]] (cp)
* ''c''<sub>t</sub> = total compressibility of formation and its fluids (psi<sup>–1</sup>)
* ''c''<sub>t</sub> = total compressibility of formation and its fluids (psi<sup>–1</sup>)
* ''r''<sub>w</sub> = wellbore radius or hole size (ft)
* ''r''<sub>w</sub> = wellbore radius or hole size (ft)