Table 2: Phase calibrators, beam sizes, rms noise, and number of radio sources detected.

Core		 Phase calibrator(s)   Beam ( $^{\prime \prime }$)   rms noise ( $\mu{\rm Jy/bm}$)a   Radio sourcesb
  Calibrator $S_{\rm 3.6\ cm}$(${\rm Jy}$) $S_{\rm 6\ cm}$ (${\rm Jy}$)   3.6 cm 6 cm   3.6 cm 6 cm   3.6 cm 6 cm

L1582A		 0530+135 $2.905\pm0.002$ $3.08\pm0.09$   $3.3\times2.7$ $12.4\times6.6$   13 29   4 (2.1) 2 (2.7)

L1689A		 1522-275 $1.210\pm 0.006$ $1.06\pm0.07$   $5.5\times2.9$ $17.1\times 10.4$   12 60   6 (2.3) 5 (1.3)
  1626-298 $2.602\pm0.015$ -                  

B133		 1939-100 $0.566\pm0.002$ -   $3.7\times3.0$ $16.9\times9.6$   11 60   4 (2.3) 2 (1.3)
  1939-154 - $0.55\pm0.01$                  

B68		 1743-309 $0.233\pm0.001$ -   $5.3\times3.0$ -   12 -   4 (2.3) -
  1751-253 $0.259\pm0.001$ -                  
a Mean rms noise in the field in $\mu{\rm Jy/beam}$; b number of radio sources detected in each field. In the parentheses is the expected number of background sources calculated using Eqs. (2), (3).

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