| http://www.w3.org/ns/prov#value | - value (d2 P/dS2); e) means for calculating a number (Smax) of samples at which a pressure of said column becomes to said upper limit pressure (Pmax) in accordance with the following formula, Pmax =P(S0)+(dP/dS)S=S.sbsb.0 (Smax -S0)+k(d2 P/dS2)S=S.sbsb.0 (Smax -S0)2 wherein k is a constant; and f) means for indicating said number (Smax) of samples thus calculated or a difference between said numbe
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