Fig. 4
HzRG field density versus rms noise. No obvious correlation between the two values is found. The error bar plotted in the upper left in included to give an indication of a typical uncertainty in the rms values. SWIRE field values are plotted as larger circles where yellow, blue, red, green and cyan correspond to CDFS, EN1, EN2, XMM-LSS and Lockman fields respectively.
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