Solar observations of the center-to-limb variation of several spectral lines were carried out in October 22-23, 1997, with the Gregory Coude Telescope (GCT) and its Czerny-Turner echelle spectrograph at the Observatorio del Teide (Tenerife, Spain). We secured spectra for 8 spectral setups in 6 different positions across the solar disk, as summarized in Table 1. Positions #1 to #5 were always at heliocentric angles theta = 0, 15, 30, 45, and 60 degrees (mu = cos(theta) = 1.00, 0.97, 0.87, 0.71, and 0.50) along a straight line crossing the center of the solar disk. Position #6 was also selected along the same direction, sometimes at theta = 75 degrees and others at 80 degrees (mu = 0.26 or 0.17). (2 data files).