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One billion dollars? “Inadequate,” says Sue Ann Arnall. And her judgment is probably fair.

Speaking of fair, Arnall’s ex-husband, Harold Hamm, was paying her what a November divorce ruling said he owed her, as determined by an Oklahoma County judge.

As Reuters reports, both Arnall and Hamm have filed appeals of the ruling.

One of Arnall’s lawyers, Ron Barber, said that she has no plan to cash the check since accepting Hamm’s payment could hurt her appeal. Arnall and Hamm both appeared in Oklahoma court on Tuesday, in part seeking to clarify how much of the November award to Sue Ann should be made available to her pending appeals in the case.

The check, which was handwritten in the amount of $974.8 million, may, indeed, be far less than what the estranged wife might be able to secure in settlements, her lawyers say.

Arnall, a former Continental executive who was married to Hamm for 26 years, contends that her award of around $1 billion in cash and assets was inadequate and allowed Hamm to keep the lion’s share of a fortune her lawyers valued as high as $18 billion.

Hamm had already paid his former wife more than $20 million during the divorce proceedings.

Meanwhile, Hamm himself is in disagreement with the November number; $1 billion is too much, his side says. Thus, the appeal.

Hamm and Arnall’s saga is one of the largest divorce cases in U.S. history.