astroquery.alma.utils.approximate_primary_beam_sizes(frequency_support_str, dish_diameter=<Quantity 12. m>, first_null=1.22)[source]

Using parse_frequency_support, determine the mean primary beam size in each observed band

frequency_support_str : str

The frequency support string, see parse_frequency_support

dish_diameter : Quantity

Meter-equivalent unit. The diameter of the dish.

first_null : float

The position of the first null of an Airy. Used to compute resolution as \(R = 1.22 \lambda/D\)