FillMode

This argument selects one of four methods for filling the positions with pictures:

0 Irregular. Positions are always selected at random.

1 Regular, if N(Pos) is a divisor of the total number of positions. The positions are selected equally spaced with respect to their indices within the position definition, starting with the position of the non-random picture.

2 The first N(Pos) positions are filled with random elements for the set.

3 The first N(Pos) positions are filled with elements for the set in original order.

Note that modes 1 and 2 map to mode 0, if the indices of the position definition have been mixed by the MP-trial command.