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ra: the central right ascension. values range from 200 to -80. EVLA values will be radians in the J2000 equatorial equinox.Units: Degrees
dec: the central declination. values range from 63 to -1.5. EVLA values will be radians in the J2000 equatorial equinox.Units: Degrees
exposure_time: the total exposure time of the observation.
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