What is the test for a motion for a new trial based on newly discovered evidence?

The general rule governing new trials based on newly discovered evidence, in the majority's words, is that "(1) the evidence must have been discovered since the trial; (2) it must be material to the factual issues at the trial, and not merely cumulative nor impeaching the character or credit of a witness; (3) it must be of such a nature that it would probably produce a different verdict in the event of a retrial. United States v. Costello, 255 F.2d 876 (2d Cir.), cert. denied 357 U.S. 937, 78 S.Ct. 1385, 2 L.Ed.2d 1551 (1958)." Using this test, the district court, below, denied appellants' motion for a new trial, see United States v. Lombardozzi, 236 F.Supp. 957 (E.D.N.Y. 1964), aff'd 343 F.2d 127 (2d Cir. 1965).