and D (1 km). The configuration is typically switched every four months or so. The reason for changing the separations is that although configuration A has the highest resolution, it also has the lowest sensitivity to faint objects. Conversely, configuration D has the highest sensitivity, but the lowest angular resolution. Hence, the optimal configuration depends on the use to which the VLA is to be put. The VLA can observe in various bands between 75 MHz (400 cm) and 43 GHz (0.7 cm), summarized in Table 7.3, and the beam size and angular resolution in configuration A vary inversely with wavelength between 10° and 1', and 24" and 0.05", respectively.
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