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RASCALL (for Rapid Approximate Spectral Calculations for All) is a code for efficient approximation of many molecular spectral lines. The shear quantity of molecular species and the quantities of lines produced by each make calculating lines to state-of-the-art accuracy a time-consuming process, making it a challenge to generate the spectral information necessary to interpret transmission spectroscopy data of exoplanet atmospheres. RASCALL input is information on molecular species and output is a RASCALL database of molecular lines.