Oil Leak at Back of Engine - Rear Main Seal or Oil Pan Gasket?

I have an oil leak at the back of the engine and I am trying to determine the source of the leak. I can't tell if the source is the rear main seal or the oil pan gasket. I suppose that I could simply replace both since I have to drop the oil pan in either case. Your suggestions are appreciated.

11/14/239:58 AM

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