How to change marker view?

Hello!

I have the next problem.
I have created ntuple and read it.
I want to Draw “x” vs “y” with circle marker.

void NTuple_create()
{
	
	TNtuple *ntuple = new TNtuple("ntuple","data","x:y");
	for(int i = 0; i < 100; i++)
	{
		ntuple->Fill(i, sqrt(i));
	}
	
	TFile *f = new TFile("D:\\Data_work\\basic.root","RECREATE");
	ntuple->Write();
	f->Close();
}

void ReadNTuple()
{
	TFile *f = new TFile("D:\\Data_work\\basic.root");
	TNtuple *my_ntuple = (TNtuple*)f->GetObjectChecked("ntuple", "TNtuple");
	
	my_ntuple->Draw("x:y");
}

I have marker №1 by default, but I want to have №4.
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What code should I add in my program in order to have marker №4 by default?

Thanks for advance.

ntuple->SetMarkerStyle(4);

Thank you for helping me!

All markers attributes are listed here:

root.cern.ch/doc/master/classTAttMarker.html