Table 1: Description of the data-set used for this work.
filter Exp-time seeing airmass
Bulge -- Baade window
calibration data, June 6, 2003
U 3 $\times $ 350 s; ${\sim} 1\hbox{$.\!\!^{\prime\prime}$ }3$ 1.18-1.23
V 30 $\times $ 60 s; $0\hbox{$.\!\!^{\prime\prime}$ }7$- $1\hbox{$.\!\!^{\prime\prime}$ }6$ 1.00-1.13
NGC 2477
test data, January 20, 1999
$I_{\char93 853}$ 6 $\times $ 900 s; $0\hbox{$.\!\!^{\prime\prime}$ }9$- $1\hbox{$.\!\!^{\prime\prime}$ }1$ 1.05-1.33
NGC 6121 (M 4)
Epoch I: August 17-18, 1999
B 3 $\times $ 180 s; ${\sim} 1\hbox{$.\!\!^{\prime\prime}$ }3$ 1.04
V 3 $\times $ 180 s; ${\sim} 1\hbox{$.\!\!^{\prime\prime}$ }5$ 1.20
Epoch II: June 21, 2002
B 3 $\times $ 5 s; 1 $\times $ 100 s; ${\sim} 1\hbox{$.\!\!^{\prime\prime}$ }4$ 1.20
V 3 $\times $ 10 s; 6 $\times $ 90 s; ${\sim} 1\hbox{$.\!\!^{\prime\prime}$ }1$ 1.10
NGC 6397
Epoch I: May 14, 1999
B 1 $\times $ 20 s; 2 $\times $ 240 s; ${\sim} 1\hbox{$.\!\!^{\prime\prime}$ }1$ 1.10
V 1 $\times $ 20 s; 2 $\times $ 240 s; ${\sim} 1\hbox{$.\!\!^{\prime\prime}$ }2$ 1.08
I 1 $\times $ 20 s; 2 $\times $ 240 s; ${\sim} 1\hbox{$.\!\!^{\prime\prime}$ }0$ 1.09
Epoch II: June 18, 2002
U 3 $\times $ 35 s; 3 $\times $ 240 s; ${\sim} 1\hbox{$.\!\!^{\prime\prime}$ }4$ 1.08
B 3 $\times $ 5 s; 3 $\times $ 90 s; ${\sim} 1\hbox{$.\!\!^{\prime\prime}$ }2$ 1.10
V 3 $\times $ 3 s; 8 $\times $ 70 s; ${\sim} 1\hbox{$.\!\!^{\prime\prime}$ }3$ 1.11
I 1 $\times $ 3 s; 2 $\times $ 3 s; ${\sim} 1\hbox{$.\!\!^{\prime\prime}$ }1$ 1.21
  1 $\times $ 49 s; 3 $\times $ 50 s; ${\sim} 1\hbox{$.\!\!^{\prime\prime}$ }1$ 1.21

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