Or, if the flowmeter is wrong by a factor of 2 (so no need for a "steam riser" circuit bypassing the ec-cats) then it can equally well be wrong by a factor of 4.
Exhibit 235-09 - Exhibit 9, indicates the flow meter is off by factors of 3 to 6, depending on conditions. (See the Table on p. 3, and the graph "Actual Flow Rate to Ratio of Reported to Actual.)