Magnitude range covered by the VVV Ks-band variability campaign observations along the Galactic minor axis. The solid lines with triangles mark the limits covered by the stellar sources, with the value of the total magnitude range shown in each position. The increasing sky brightness towards the Galactic centre is due to the contribution of the underlying, unresolved faint stars. The upper dotted line with triangles shows the mean value of the brightest sources, including objects flagged as saturated. Similarly, the lower dotted line with triangles marks the limiting magnitude of all sources, including those below the 5-σ limit.
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