
Static range slice along dim 1 (the scanned axis).
g_slice_t.Rdx[from:to, ...] keeping the leading axis: the building block for
scan bodies that pair a series with its own shift (e.g. an RTS
smoother reading the NEXT step's prediction).

g_slice_t.Rdx[from:to, ...] keeping the leading axis: the building block for
scan bodies that pair a series with its own shift (e.g. an RTS
smoother reading the NEXT step's prediction).