intiffs generally rely on treatise material from Wright & Miller, 8 asicral Practice & ?Paco:lure Civ.2d, §2041, and cases cited therein. The case of Gaella v. OnaSsis, 487 F.2d 986, at 997 (2d CG. 1973). cited by Plaintiffs, makes clear that the exclusion of a party from a deposition "should be ordered rarely ind