Hi Donald,
When running to3d to create a time series dataset, it is
necessary to provide a 'tpattern', which is to say that
the user must know what the timing is.
Dimon, for example, assumes alt+z (probably the most
common timing), though that can be changed with an option.
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Slice timing correction is best done via 3dTshift, though
it can be done in 3dvolreg, too, with limited options.
- rick