that we are near the top of the red detuned peak of the last graph in Fig. \[atnogrid\](a). We can see a gain in the probe at around 33 MHz. The blue curve in the background is fit to the sum of Lorentzian and inverted Lorentzian both of FWHM 4.5 MHz, and the red dashed curve for the empty cavity is a Lorentzian with FWHM of 9.5 MHz. (b) This figure shows line narrowing and gain without the Fano structure when the cavity is slightly red of the red detuned peak of the last graph in Fig. \[atnogrid\](a). A Lorentzian fit to the blue trace gives FWHM of 3.3 MHz and is shown as the blue curve. Here, for (a) and (b) $N_c = (33 \pm 1) \times 10^3$. (c) Without MOT laser and cavity freq same as atomic. (d) With MOT laser and cavity freq. same as atomic freq. (e) With MOT laser and cavity freq. towards blue of atomic freq. (f) With MOT laser and cavity freq. more towards blue of atomic freq to make the heights of the peak same. For (c)-(f), $N_c = (25 \pm 1) \times 10^3 $. The power in MOT laser for all 