VVV K_s phase-folded light curves for variable candidates in the M 22 field selected as cluster members, as shown in Sect. 4.2. For every variable candidate, we provide its identifier, its (rounded) period in days, and its variable type (where available). The data for the light curves of all the variable candidates found in the studied area, including those used to create this figure, are available in electronic form at the CDS.