The spectroscopic pipeline design for the ELT METIS

The Mid-Infrared ELT Imager and Spectrograph (METIS) is going to be one of the first-light instruments on the upcoming ESO Extremely Large Telescope and will be the only one that will operate in the mid-infrared regime. It will have five observational modes ranging from direct imaging to long-slit spectroscopy and integral-field spectroscopy. All five modes will be operational at the diffraction limit of the ELT assisted by adaptive optics. In this paper, we describe the reduction process and discuss the workflow design and algorithms for the long-slit spectroscopic mode of METIS at its Final Design Stage.