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Take 1E-13 solar masse as target regime. Einstein radius is 3E=7 smaller than solar mass MACHO. 

Quasar ulensing paper from Kochanik has this table: 


Lens R_e is for 0.3 solar masses. We are down by sqrt(1E-13/0.2) = 5 e-7. So for a favorable source, lowest mass lensed QSO, we have R_e=7.8e9 cm, and Rs=2e12. Ouch. 

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