[amibroker] explanation of code

["epintoem" <epintoem@xxxxxxxxx>]

t=Param("t",10,10,30,5); 
y=RSI(t)/100;RSIema1=C;RSIema2=C;
for(i=t;i<BarCount;i++)
{
RSIema1[i]=y[i]*C[i]+(1-y[i])*RSIema1[i-1];
RSIema2[i]=(1-y[i])*C[i]+y[i]*RSIema2[i-1];
}
Plot(C,"C",1,8);
Plot(RSIema1,"RSI_ema1",colorRed,1);
Plot(RSIema2,"RSI_ema2",colorBrightGreen,1);
//Plot(RSI(t),"RSI",2,styleOwnScale);

I copied this indicator from the files section here.....

When i try to use it and check it, it says it uses future quotes.
What part of this AFL uses future quotes ?

TIA




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