DYNAMIC RANGE LIMITS

• Atmospheric fluctuations: 1000:1

  • Fix with self-calibration

• Closure errors

  • VLA continuum: 20,000:1
  • VLBA, VLA line: > 100,000:1

• With baseline calibration

  • VLA about 200,000:1

• WSRT about 400,000:1

• Ultimate: peak flux / thermal noise

  • Could be  on strongest sources

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