Calculating S/N in Empower2&Empower3?

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<p>Hi,</p><p></p><p>Can any body guide me on calculating USP S/N and Ep S/N.</p><p></p><p>I have ppt regarding s/n.</p><p></p><p>But i want you to say whether  Base line noise or Peak to Peak is prefferabale to calculate s/n.</p><p></p><p></p><p>Help me out on this.......</p><p></p><p></p><p>Regards</p><p>Satya</p>