SELF_SNR

    Minimum Signal to Noise ratio on the antenna gain to consider a solution  to
    be  valid  for  an  antenna. 6 is a good value, 3 a lower limit. Beware that
    this SNR makes sense only if the a priori estimate of the noise from the  UV
    weights is correct: see SELF_SNOISE.

    In  practice,  it is the product SELF_SNR * SELF_NOISE that must be adjusted
    correctly.