CS J = 1 → 0 line observed toward W3(OH). a) Line frequency in the band center. b) Line frequency next to an edge of the band. c) A 40-MHz zoom of both spectra centered at the line. The comparison of both spectra is satisfactory, both in frequency and intensity scale. The upper spectrum a) is less noisy than the lower one b) owing to different integration times (8 and 3 min, respectively).