What is the test for deferential approach by an appellate court in reviewing a family law support order?

20 In Hickey v. Hickey, 1999 CanLII 691 (SCC), [1999] 2 S.C.R. 518, L’Heureux-Dubé J. wrote regarding the deferential approach for an appellate court in reviewing support orders (at paras. 10-11): When family law legislation gives judges the power to decide on support obligations based on certain objectives, values, factors, and criteria, determining whether support will be awarded or varied, and if so, the amount of the order, involves the exercise of considerable discretion by trial judges. …. Because of its fact-based and discretionary nature, trial judges must be given considerable deference by appellate courts when such decisions are reviewed. … [A]ppeal courts should not overturn support orders unless the reasons disclose an error in principle, a significant misapprehension of the evidence, or unless the award is clearly wrong. ….