Indicates which method TANK uses in computing the optimum cosine curve for determining the out-of-plane shell deflection. The available methods are:
FOURIER SERIES
Implements the procedure outlined in the paper Simple Method Calculates Tank Shell Distortion, by F. A. Koczwara, published in Hydrocarbon Processing, August 1980.
LEAST SQUARES
Employs a least squares approach to the solution of the optimum cosine curve.