EPIC and pn searches around the 2012 periodicity. The frequency range is ν = 0.2948−0.2953 Hz. The periodogram in the background (dashed outline) shows the 2012 result: ν₂₀₁₂ = 0.2951709(14) Hz and (ν₂₀₁₂) ∼ 50 (obsid 0671620101, pn, 0.5–1.35 keV). The four plots show for each AO14 observation the results of tests conducted in seven different energy bands for an extraction region of 100″ (see text). The dotted and dashed horizontal lines show the 2σ and 3σ confidence levels for the detection of modulations in each observation.