CasaPy

[saracmbr]

Hi there,
I've got 2 more questions.
I need to calculate the break frequency for my diffuse source. I know that the spectral brightness is I(nu)=tt0+tt1*((nu-2.1)/2.1) Jy/beam.
Now my questions are:

1- How I can calculate the total flux of my extended source in different frequency ( Not at the central frequency which is 2.1GHz in my case) using the spectral brightness(I(nu)).

2- As the spectral brightness has the unit of Jy/beam, is this the central frequency beam or it is the proper beam related to that frequency?

Cheers,
Sara