The period sampling of GERBLS. The blue line represents uniformly sampled orbital frequencies (frequency differential Δf = const.), whereas the green line shows a sampling that is uniform in orbital period (Δf ∝ P⁻²). GERBLS (solid black dots) natively produces a sampling that is broadly a combination of the two, with the frequency differential approximated by Δf ∝ P⁻¹ (red line). Smaller jumps between frequencies occur when moving from one folding transform to the next (with a base period larger by 1). When automatic downsampling is switched on (orange dots), the frequency differential can be well approximated as Δf ∝ P^−0.72, which is close to the optimal search resolution of Δf ∝ P^−2/3 for planets on circular orbits as demonstrated by A. Ofir (2014).