l = å ai× T i, where the summation is from i = 0 to nTerms - 1
lg(l/lo) = A + B×(1 - T/C)2/7
l = å ai× T i, where the summation is from i = 0 to nTerms - 1
l = å ai× T i, where the summation is from i = 0 to nTerms - 1
l = a1 + å(ai+1 ×ti/3) , where the summation is from i = 1 to nTerms -1 and t = 1 - T/Tc