For these reaction conditions the following formula was used for the purposes of plotting the line shown in FIG. 1: [H 1 MI 339x10 2.27 The ethylene and hydrogen concentrations used in each of these examples, as well as the melt index and other properties of the resulting polymers are shown in the following Table IV: TABLE IV Example 26 27 28 29 02H; concentration (mole percent) 17. 7(=!;10%) 16.