Deeprange estimated ﹩s_{3}﹩ (triangles) and ﹩s_{4}﹩ (squares). Open symbols denote the results when all survey masks are used; filled symbols show the results when only the top 5% largest masks are used. Dotted and dashed lines correspond to a ﹩\chi ^{2}﹩ fit of the three‐point correlation function with third‐order terms free or locked to zero, respectively. The error bars are estimated using the nonlinear FORCE package. Systematic error estimates are also shown for the faintest (﹩I> 21﹩) results as right‐shifted error bars. The dash‐dotted and long‐dash‐dotted curves display the results of the APM and EDSGC surveys, respectively, in the top left (﹩17\leq I< 18﹩) panel.