The data required by the cable pre-static step for each cable are its axial stiffness and its apparent weight (weight in water) per unit length. These are automatically retrieved or calculated from the data you specify under the *GEOMETRIC SETS keyword. One important point to note is that the cable properties are assumed constant over each cable. Where a cable is comprised of elements with different stiffnesses and/or weights, constant values are automatically computed as an average of the various values for these elements. You should therefore not group large numbers of elements with very different properties together in single cables, since a particular average might give a poor representation of the distribution of a property over the cable.
