Average outflow candidate OCLs for PHANGS galaxies. Black crosses represent the per galaxy, which is the average of the inspector-averaged OCL of the pv–diagram, lwm, and the higher ranked spectrum. Galaxies with OCL ≳ 2 are highly likely to exhibit strong central outflow signatures, whereas OCL ≲ 1 correspond to an absence of any outflowing gas signatures. For each galaxy the inspector-averaged OCLs of the individual methods are shown as red circle (central spectrum with 300 pc aperture), purple square (spectrum of annulus with 2 kpc outer diameter), blue triangle (pv–diagram), and light-blue diamond (lwm). The green-shaded area marks all 2 ≤ OCL ≤ 3. A galaxy with (and lwm-OCL ≥ 2) is considered an (secure) outflow candidate and emphasized with green galaxy names (see Sect. 4.2). Uncertainties are derived by perturbing and jackknifing the OCL per method per inspector, as described in the text.