Measured broadening when using a sincgauss model (broadened Gaussian emission-line) to fit two unresolved emission-lines. We have simulated the fit with a sincgauss model of two unresolved emission-lines with different flux ratios. We can clearly see that the measured broadening can be very different from the real velocity separation and depends strongly on the flux ratio of the unresolved lines. Note that, at the resolving power of our data (R = 4800), two components are considered resolved when separated by more than 63 km s⁻¹. The dotted line is the bisectrix, meaning equality between the two quantities.