Spectroscopy files are available from the main Data Archive Server page. Data for individual plates are in subdirectories specified by $plate/$mjd, where valid $plate/$mjd combinations are in Table 4.
Calibrated spectra which have been extracted from the spectroscopic frames with the spectro2d pipeline (§ 4.10.1) are available under the root URL via
2d_10/$plate/2dmerge/spMerge2d-$mjd-$plate-$fiber.fit,where $plate is the plate number (four digits, zero padded), $mjd is the date observations were completed (Table 4), and $fiber is the fiber number (three digits, zero padded).
Calibrated spectra, with information from the spectro1d pipeline (§ 4.10.2), such as redshift and identification, are available under this root URL via
1d_10/$plate/1d/spSpec-$mjd-$plate-$fiber.fit.