Why does the second 90° pulse to spin one in the INEPT experiment (Fig. 7.15 on page

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Why does the second 90° pulse to spin one in the INEPT experiment (Fig. 7.15 on page 168) have to be about the y-axis?
Show that changing the phase of the first 90° pulse from x to -x results in the following observables on the S spin at the start of acquisition:
-ks cos (27J15T2) Ŝ,- ky sin (2nJis T2) sin (2rJrsT1) S-
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