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We explore the impact of reionization topology on 21-cm statistics. Fourreionization models are presented which emulate large ionized bubbles aroundover-dense regions (21CMFAST/ global-inside- out), small ionized bubbles inover-dense regions (local-inside-out), large ionized bubbles around under-denseregions (global-outside-in) and small ionized bubbles around under-denseregions (local-outside-in). We show that first-generation instruments mightstruggle to distinguish global models using the shape of the power spectrumalone. All instruments considered are capable of breaking this degeneracy withthe variance, which is higher in outside-in models. Global models can also bedistinguished at small scales from a boost in the power spectrum from apositive correlation between the density and neutral-fraction fields inoutside-in models. Negative skewness is found to be unique to inside-out modelsand we find that pre-SKA instruments could detect this feature in maps smoothedto reduce noise errors. The early, mid and late phases of reionization imprintsignatures in the brightness-temperature moments, we examine their modeldependence and find pre-SKA instruments capable of exploiting these timingconstraints in smoothed maps. The dimensional skewness is introduced and isshown to have stronger signatures of the early and mid-phase timing if theinside-out scenario is correct.

Distinguishing models of reionization using future radio observations of 21-cm 1-point statistics