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Fig. 3.

image

Star formation laws based on the surface densities (left) and the midplane volume densities (right) of the total gas and the SFR for the sample of ten dwarf galaxies studied in this paper (diamonds). Each colour indicates the azimuthally averaged radial profile of a different galaxy according to the colour-bar. The light blue points and the green crosses respectively indicate the star-forming regions within and beyond the optical radius for the sample of 12 galaxies of B19a, while the yellow stars are for the MW (B19b). Left panel: the grey dashed line is the SK law from de los Reyes & Kennicutt (2019) with its intrinsic scatter (grey dotted lines). Right panel: the long-dashed orange line shows the best-fit VSF law from B19a, while the red solid line is the best-fit obtained in this work. The black dot-dashed line displays the orthogonal intrinsic scatter of the new best-fit, while the grey areas indicates the 1σ and 3σ uncertainties on the fit. The VSF law has a smaller scatter than the SK law and it is a power-law with index α ≈ 2, showing no indication for a break over a wide range of densities.

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