The GTC exoplanet transit spectroscopy survey - X. Stellar spots versus Rayleigh scattering: the case of HAT-P-11bF. Murgas, G. Chen, E. Pallé, L. Nortmann and G. NowakA&A, 622 (2019) A172DOI: https://doi.org/10.1051/0004-6361/201834063