VMRs of line species (¹²CO, H₂O, Ca, Na, Ti, and K) for the three BDs using the FC and EC method. The error bars represent the values retrieved with the FC method. The dashed lines show the Fastchem EC abundances corresponding to the best-fitting P-T profile, C/O ratio, and metallicity for each of the BDs. The EC abundances have a similar line style and colour as those of the associated FC VMR. The black lines indicate the location of the peak of the integrated contribution functions, and the shaded areas indicate the pressures where we expect large uncertainties as we are not sensitive to probe these atmospheric pressures.