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<s> The optional stream to use in conjunction with the distribution’s probabilities. If this option is omitted, ProModel will use stream one. For more information on streams, see Streams.
<ax> An optional axis shift. The distributions, E, G, W, L, IG, P5, and P6 all normally have a minimum value of zero. Use an axis shift to alter the distribution’s minimum value and at the same time shift the entire distribution. Any time an axis shift is specified, a stream must be specified also.
Any negative value returned by a distribution that is used for a time expression will be automatically converted to zero.