Observations 1. Observing Lines & Frequencies 13CO J=1 - 0, 110.201353 GHz 2. Observed Regions/target sources L1551 3. Observing period: May 2004 4. Receiver frontend: BEARS 5. Receiver backend: AC45 6. Frequency & Velocity resolutions: 37.8 kHz, 0.1 km/s 7. Total bandwidth & Velocity Coverage: 32 MHz, 87.4 km/s 8. Typical system temperature & typical atmospheric opacity: 350 --- 600 K @El 50 - 60 Degree 9. Main-beam efficiency: 45 % 10. Observation mode: OTF / position switch / frequency switch position switch 11. OFF Position (s) if OTF/Position switch is applied; (4h32m50s, 18d00'00") (B1950) 12. Pointing Calibration & Pointing error: NML-Tau, < 5 arcsec. 13. Intensity Calibration & Accuracy of absolute scale: W51, S140, 10% 14. Noise level: Ave. 0.58 K, s.d. 0.17 K 15. CUBE FITS Information Mapping area: BLC(4h29m28.9s, 17d44'35.2") TRC(4h26m05.3s, 18d29'31.8") Velocity 0 --- 15 km/s Grid spacing: 20.6" CUBE size: (x, y, z) 142 x 132 x 150 16. Other information