Result of REDLINE in the presence of a single cloud using simulated observations. The diamonds with error bars are the different distance-extinction pairs (left axis), the solid line is the derivative of the extinction with respect to distance, the dashed line is the diffuse extinction, and the dotted lines show the 1 and 2-σ levels (right axis). Here a cloud is clearly detected at 4 kpc, identical to the injected cloud distance.