**Table 5:** Spatial distribution of different types of stars in the four chips of the South field. The Pre-Main Sequence stars included here are only those that can be identified individually, i.e. those with (m_F675W-m_F656N)>0.5. For typographical convenience we report the Poissonian uncertainty as the square root of the observed number of stars in each bin.
Chip	Massive stars	PMS	Red Clump
PC	$2\pm1.4$	$6\pm2.4$	$25\pm5$
(PC $\rightarrow$ WF^a	$9.7\pm6.8$	$28.8\pm11.8$	$121\pm24$ )
WF2	$24\pm4.9$	$100\pm10$	$63\pm7.9$
WF3	$29\pm5.4$	$137\pm11.7$	$61\pm7.8$
WF4	$9\pm3$	$123\pm11.1$	$51\pm7.1$
Total	$64\pm8$	$366\pm19.1$	$200\pm14.1$
(Total $\rightarrow$ WF^b	$19.9\pm2.5$	$114.4\pm6.0$	$62.3\pm4.4$ )

^a Detections in the PC per unit WF area, i.e. 4.8 times larger.
^b Total detections per unit WF area, i.e. 3.2 times smaller than the entire field.

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