The value of the constant \(R_{\mathrm{H}}\) in Equation 26-14, called the Rydberg constant, is chosen to match the experimental data. To four significant figures, \(R_{\mathrm{H}} = 1.097 \times 10^7\ \mathrm{m}^{-1}\) As an example, the hydrogen absorption and emission lines shown in Figure 26-12 all correspond to \(n =2\) in Equation 26-14. The series of wavelengths for which \(n =2\) are called the Balmer series.