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Nominal simply means "name". A nominal 10 week projection refers to 10 calender weeks. The offsets used for a nominal 10 week projection factor in holidays and weekends. Therefore, the offsets represent 10 calender weeks in trading days.
You can find all the nominal cycles and the according offsets in chapter 1.3 Eliades' Cycle Offsets of the documentation.
There is no special meaning. They are valid default offsets from the Eliades' cycle offsets and we didn't want to default the inputs 0.