Natural-weighted noise values measured over a 1.4 km s⁻¹ channel as a function of integration time for the observations of ESO 300-G014 (J0309–41). The black filled points indicate the measured noise level. The blue line shows the expected theoretical noise levels with a slope of −0.5. A linear fit to the observed noise levels gives a slope of −0.504. The red star indicates the target sensitivity from de Blok et al. (2016).