Predicted H_α line profiles from simulations for E19, E31, E36 and E52 (first, second, third, and last rows, respectively) shown along LOS in the z, y, and x (first, second and last columns, respectively) directions. The grey-shaded regions represent the calculated results. The solid black lines indicate the total flux (from SF, the accreting primary and secondary MBHs) along with the noise component and the red-dotted lines show the contribution only from SF.