Judgement in the Omagh bombing civil appeal is due to be delivered later.
It was brought by Michael McKevitt, Liam Campbell, Colm Murphy and Seamus Daly, after they were found liable two years ago for the bombing.
The families of some of those killed in the atrocity won the landmark civil case and were awarded £1.6m in damages.
That is also being appealed by their lawyers who said it should have been more because of the scale of the outrage.
Twenty-nine people were killed in the Real IRA attack. They included a woman pregnant with twins.