Equation Icon  ( ) ( ) ( ) ( ) ( ) ( ) πœ–TOA Spsr −1 Trec + Tsky G − 1 Δν − 1βˆ•2 tint −1βˆ•2 W 3βˆ•2 -----≃ ----- ----------- -----−1- ----- --- --- . (8 ) P mJy K K Jy MHz s P