Structure for the spline tuple is a tuple of key value pairs.

The following keywords ( = default values) may be used:

• method = 1
  0 : Imposes zero-displacement condition on aerodynamic boxes. 1 : Defines a surface spline method (Infinite Plate Spline method) for CAERO7. 2 : Defines a beam spline method for CAERO7 / BODY7. 3 : Defines a 3-D spline (Thin Plate Spline method) for CAERO7 / BODY7.

• attachFlex = 0
  Linear attachment flexibility (for spline method 1)

• eps = 1e-6
  Multiplication factor to obtain a small tolerance to detect any duplicated location of structural grid points. The tolerance is computed by EPS×REFC, where REFC is the reference chord defined in the AEROZ bulk data card (for spline method 1 or 3)