Integrated line intensities for the whole range of quantum numbers n of the observed Hnα RRLs. Open squares refer to the observational data, while the lines show the LTE (blue line) and non-LTE prediction of our model (dashed and solid red lines for the cases of the Walmsley and the Storey & Hummer b_n coefficients respectively). With green dashed lines we show the limits among the different wavelength ranges. References for the observational data: H4α to H15α Thum et al. (1998); H21αThum et al. (1994b); H26α and H30α Thum et al. (1994a); H30α Martín-Pintado et al. (1989a); H35α and H38αMartín-Pintado et al. (1994); H41α Martín-Pintado et al. (1989a); H66α Loinard & Rodríguez (2010); H66α Martín-Pintado et al. (1993); H76α Escalante et al. (1989).