<?php function GrayML ($TL,$Ta,$Tb) {$TC=4.117487+2.069453*$TL+1.464245*$Ta+0.497313*$Tb+0.004516*pow($TL,2)+0.006327*$TL*$Ta+0.002057*$TL*$Tb+-0.009354*pow($Ta,2)+-0.010071*$Ta*$Tb+-0.006485*pow($Tb,2);
$TM=3.748392+2.085964*$TL+-0.455064*$Ta+-0.03312*$Tb+0.004349*pow($TL,2)+-0.001986*$TL*$Ta+-0.00015*$TL*$Tb+-0.003332*pow($Ta,2)+-0.00023*$Ta*$Tb+0.000324*pow($Tb,2);
$TY=3.867746+2.081353*$TL+0.03545*$Ta+-1.401147*$Tb+0.004385*pow($TL,2)+0.000113*$TL*$Ta+-0.005922*$TL*$Tb+0.000122*pow($Ta,2)+0.000679*$Ta*$Tb+-0.000212*pow($Tb,2);
return [$TC, $TM, $TY];}
?>