Hydrogen, helium, and carbon radio recombination lines observed with the GBT for α lines (the change in principal quantum number is Δn = 1) with principal quantum numbers 137, 145, 151, 155, 156, 164, 174, and 280. The velocity is given with respect to the CRRL. To reference the velocity with respect to helium or hydrogen, 27.4 or 149.4 km s⁻¹, respectively, is subtracted. The spectra are offset by a constant 0.7 K, and the 280α spectrum is scaled by a factor of 40. This data is part of project AGBT02A_028. Since all the observations are obtained using the same telescope, their spatial resolution ranges from 4.′4 to 36′.