Calculation of the rotational profile using cross-correlations. Upper panel: object spectrum and template spectrum. Lower panel, from top to bottom: a) cross-correlation function template-template CCF_TT (thin line) and the same function after removing the main peak and convolving with the provisional rotational profile, i.e. CCF2_TT ∗ G (thicker line), b) the same function CCF2_TT ∗ G scaled to the object intensity, c) cross-correlation function object-template CCF_DT, and d) rotational profile calculated subtracting CCF2_TT ∗ G from CCF_DT. In both panels arbitrary vertical shifts have been applied for clarity.