Aspect	Information
Purpose	Measure the size-luminosity relation of galaxies at redshift 𝑧 between 6 and 9, using galaxies lensed by six foreground Hubble Frontier Fields (HFF) clusters.
Methodology	Select a sample of galaxies and obtain their properties from the photometrically-derived ASTRODEEP catalogues. Measure the intrinsic size using Lenstruction software, and create completeness maps as a function of size and luminosity via the GLACiAR2 software. Perform a Bayesian analysis to estimate the intrinsic and incompleteness-corrected size-luminosity distribution, with parameterization 𝑟𝑒 / 𝐿𝛽. Investigate systematic uncertainties correlated with the choice of lens models.
Findings	The slopes of the size-luminosity relation at 𝑧  6 􀀀 7 and 𝑧  85 are 𝛽  048  008 and 𝛽  068  014, respectively, adopting the Bradac lens model. The slope derived by lensed galaxies is steeper than that obtained in blank fields and consistent with other independent determinations of the size-luminosity relation from the HFF dataset. The modeling errors are not a significant source of uncertainty in the size-luminosity relation.
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