Table 1: Published time delays and 1- $\sigma$ uncertainties for four lensed quasars, measured from their optical light curves. The percentage errors are given in parentheses.
Object Time delay [days] Reference

RXJ 0911+0551 146 $\pm$ 4 (2.7%) Hjorth et al. (2002)

FBQ 0951+2635 16 $\pm$ 2 (13%) Jakobsson et al. (2004)

PG 1115+080 23.7 $\pm$ 3.4 (14%) Schechter et al. (1997)

SBS 1520+530 130 $\pm$ 3 (2.3%) Burud et al. (2002a)

B 1600+434 51 $\pm$ 2 (3.9%) Burud et al. (2000)

HE 2149-2745 103 $\pm$ 12 (12%) Burud et al. (2002b)

**Table 1:** Published time delays and 1- $\sigma$ uncertainties for four lensed quasars, measured from their optical light curves. The percentage errors are given in parentheses.
Object	Time delay [days]	Reference
RXJ 0911+0551	146 $\pm$ 4 (2.7%)	Hjorth et al. (2002)
FBQ 0951+2635	16 $\pm$ 2 (13%)	Jakobsson et al. (2004)
PG 1115+080	23.7 $\pm$ 3.4 (14%)	Schechter et al. (1997)
SBS 1520+530	130 $\pm$ 3 (2.3%)	Burud et al. (2002a)
B 1600+434	51 $\pm$ 2 (3.9%)	Burud et al. (2000)
HE 2149-2745	103 $\pm$ 12 (12%)	Burud et al. (2002b)

Source LaTeX | All tables | In the text

	1 Measuring time delays
	2 Simulated light curves
	3 Parameter space
	4 Extracting the time delay
	5 Results
	6 Influence of "slow'' microlensing
	7 When the time delay becomes close to the length of the visibility window
	8 Conclusions
	References