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A.2. Calculation of Continuum Emission

With RHII properly determined, the radio continuum emission which occurs due to the free-free emission from the ions and electrons can be calculated by using the formula (Spitzer 1978),

Equation A7 (A7)

where, the coefficients of emission epsilonnu and absorption kappanu are given by,

Equation A8 (A8)

Equation A9 (A9)

The Gaunt factor (gff), is given by,

Equation A10 (A10)

An electron temperature of 8000 K has been assumed for all calculations. The radio continuum has been calculated at a frequency of 5 GHz.