High-energy 3−300 GeV TS map, integrating 4 yr of data (in this case, the highest energy used is 300 GeV following recommendations for the use of Pass 7 data). The contour black dashed lines are TS surfaces representing 68%, 95%, and 99% containment region for the γ-ray signature (from inner to outer lines). The 2WHSP J042218.3+195054 position is highlighted by a thick green circle centered on +, well within the 68% containment, while the 3FGL J0421.6+1950 source (position highlighted by the cyan circle centered on ×) is localized within the 95% containment region.