In an octahedral crystal field, the t_2g orbitals are :

lowered in energy by $0.6{\mathrm{\Delta }}_0$

$\text{ raised in energy by }0.4{\mathrm{\Delta }}_{\mathrm{o}}$

$\text{ lowered in energy by }0.4{\mathrm{\Delta }}_{\mathrm{o}}$

raised in energy by $0.6{\mathrm{\Delta }}_0$