I did not know that. Here is the code. 
input indicator    = { T1, T2, default T3, T4, T5, T6 };
input price        = close;
input period       = 10;
input volumeFactor = 0.70;
input displace     = 0;
input sign         = { default plus, minus };
input Label        = Yes;
input paintbars    = No;
script _gd {
input _price  = close;
input _period = 10;
input _v      = 0.70;
input _sign   = { default plus, minus };
def _ema      = ExpAverage( _price, _period );
plot _gd      = ( _ema * ( 1 + _v ) ) – ( ExpAverage( _ema, _period ) * _v );
}
def _t1 = _gd( price[-displace], period, volumeFactor, sign );
def _t2 = _gd( _t1,   period, volumeFactor, sign );
def _t3 = _gd( _t2,   period, volumeFactor, sign );
def _t4 = _gd( _t3,   period, volumeFactor, sign );
def _t5 = _gd( _t4,   period, volumeFactor, sign );
def _t6 = _gd( _t5,   period, volumeFactor, sign );
plot T3;
switch( indicator ) {
case T1:
T3 = _t1;
case T2:
T3 = _t2;
case T3:
T3 = _t3;
case T4:
T3 = _t4;
case T5:
T3 = _t5;
case T6:
T3 = _t6;
}
T3.AssignValueColor(if T3 > T3[1] then Color.White else Color.Red);
T3.SetLineWeight(3);
T3.HideBubble();
AddLabel(Label, if T3 > T3[1] then ”  T3-10 Up  ” else ”  T3-10 Down  “, if T3 > T3[1] then color.green else color.red);
assignPriceColor(if paintbars and T3 <T3[1] then color.red else if paintbars and T3 > T3[1] then color.green else color.CURRENT);
def t3CrossesUp = T3 > T3[1] and T3[1] < T3[2];
def t3CrossesDown = T3 < T3[1] and T3[1] > T3[2];
Alert(t3CrossesUp, "T3 Crossing Up", Alert.BAR, Sound.RING);
Alert(t3CrossesDown, "T3 Crossing Down", Alert.BAR, Sound.RING);