Representative spectra from a balloon-borne spectrograph (black) and IRIS (orange). Whereas the strengths of the k and h emission lines vary for these spectra because they were acquired at different epochs, the continua are similar because they arise from the relatively constant photosphere. The smooth blue and red curves are convolutions of the balloon spectrum with 0.1 nm and 1.0 nm FWHM triangular response functions, respectively.