# approximate_primary_beam_sizes¶

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

Parameters:
frequency_support_strstr

The frequency support string, see parse_frequency_support

dish_diameterQuantity

Meter-equivalent unit. The diameter of the dish.

first_nullfloat

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