Some calls leave the setup in a "C1 phantom" formation, and some calls leave the setup in a nearly-identical 4x4 matrix formation. Occasionally one wishes that the program had made the other choice. For most applicable calls and concepts it doesn't matter, because the program is generally forgiving about these two formations. (For example, the `split phantom waves' concept will work from a phantom formation.) On those occasions when you need to change from one formation to the other, you can use the `phantom' concept or the `4x4 matrix' concept with the call `nothing'.
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