Left panel: ratio of the DK Cha Brackett lines with respect to Br γ plotted as a function of the upper quantum number (n_up; filled black circles). For comparison the Brackett decrements for the Class I source HH100-IRS (Nisini et al. 2004, open blue triangles) and the weighted mean line ratios for the Brackett series on the CTTSs sample of Bary et al. (2008, open green squares) are also included in the plot. Right panel: ratio of the DK Cha Paschen lines with respect to the Pa β line as a function of the upper quantum number n_up (black filled circles). For comparison, the weighted mean line ratios for the Paschen series on the CTTSs sample of Bary et al. (2008, open green squares) are also shown.