calculate omega squared. does the omega squared represent a small, medium, or large effect size?

Tests of Between-Subjects Effects Dependent Variable: Dependent Type Ill Sum Source of Squares df Mean Square F Sig Corrected Model 28.933(a) 14.467 14.467 .001 Intercept 528.067 528.067 528.067 .000 Method 28.933 14.467 14.467 001 Error 12.000 12 1.000 Total 569.000 15 Corrected Total 40.933 14 a R Squared = .707 (Adjusted R Squared = .658) Estimated Marginal Means Method Dependent Variable: Dependent 95% Confidence Interval Method Mean Std. Error Lower Bound Upper Bound A 6.000 447 5.026 6.974 B 7.600 .447 6.626 8.574 4.200 .447 3.226 5.174