Mode parameter biases as a function of linewidth for a stellar background bias of +1%, for several signal-to-noise ratios and for three different kinds of profiles which are: a triplet l = 0,1,2,3 with a splitting of 2 μHz with the mode pairs l = 0 − 2 and l = 1 − 3 separated by 120 μHz (black line); a triplet with a splitting of 6 μHz with the mode pair l = 0 − 2 and l = 1 − 3 separated by 120 μHz (green line); and a single mode profile (red line). (Top, left) For mode linewidth, (top, right) For mode height ratio, (bottom, left) For mode amplitude.