All Tables

• Table 1: Partial stability criteria. The values range from 1 (best) through 3 (worse), with a rejection value of 10.
• Table 2: Efficiency estimates for the tested stability schemes.
• Table 3: Type of noise for the stable and unstable sources as qualified by scheme (e), expressed as the percentage of the types of noise in both categories.
• Table 4: Stable sources with random walk noise.The table gives the source stability index, the slope of the Allan variance graph and the Allan standard deviation for a four-year sampling time.
• Table 5: Stability index and ICRF source qualifiers: number of sources.
• Table 6: Stability criteria for 362 well observed extragalactic sources, 1989.5-2002.4. The redshift and the total flux at 6 cm, 11/15 cm are given when available. "AlSd'' is the Allan standard deviation for a one-year sampling time. Stability criterion 1 is the ICRF one (d = defining, c = candidate, o = other). Stability criterion 3 is the one derived in this paper; values 1 and 2 correspond to stable sources, 3 to unstable, and 4 to highly unstable or drifting. Stability criteria 2 and 4: see explanation in the text