  We present here the preliminary design of the RIZ module, one of the visible
spectrographs of the ANDES instrument 1. It is a fiber-fed high-resolution,
high-stability spectrograph. Its design follows the guidelines of successful
predecessors such as HARPS and ESPRESSO. In this paper we present the status of
the spectrograph at the preliminary design stage. The spectrograph will be a
warm, vacuum-operated, thermally controlled and fiber-fed echelle spectrograph.
Following the phase A design, the huge etendue of the telescope will be
reformed in the instrument with a long slit made of smaller fibers. We discuss
the system design of the spectrographs system.
