Fraction of the initial deuterium burned as a function of mass until the end of the simulation (10¹⁰ years) for cold start objects. Top left: results for different helium fractions. Top right: results with different dust-to-gas ratios (or metallicities). Bottom left: results for different maximum gas accretion rates. Bottom right: results for different deuterium abundances. The uppermost run names in the plots correspond to the leftmost curves, the next lower run names correspond to the second leftmost curves etc. For the Y30 run in the upper left panel the positions of the individual mass runs are indicated with filled brown circles. For the sake of clarity we omitted plotting the individual mass run positions for all other runs. Instead a spline function was plotted through the individual mass run positions.