Differences of the logarithmic mass accretion rates for two epochs T_A and T_B as a function of the logarithmic time differences T_B − T_A for each measurement. The values are plotted as squares, where for each distinct object a different color was chosen according to its effective temperature. Overlaid are the mean values of the logarithmic mass accretion rate differences for different time bins as magenta columns, together with their estimated 1σ uncertainties.