Emgu eyes coordinates

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Emgu-CV

Hi, i am trying to detect eyes coordinates with the aim of find the center point of the face. The problem is that I can´t really understand how the MCvAvgComp[][] works so, what I do generates an IndexOutofRangeException. The code is this:

Rectangle rectangulo = new Rectangle(Izq, Superior, Ancho, Alto);
Image<Bgr, byte> subImage = ImageFrame.GetSubRect(rectangulo);

// eyes detection
ImageFrame.ROI = face.rect;
MCvAvgComp[][] eyesDetected = subImage.DetectHaarCascade(haareyes, 1.1, 10, Emgu.CV.CvEnum.HAAR_DETECTION_TYPE.DO_CANNY_PRUNING, new Size(20, 20));
subImage.ROI = Rectangle.Empty;

Int32 eyesCenterX = (eyesDetected[0][1].rect.X + (eyesDetected[0][1].rect.Width / 2)) - (eyesDetected[0][0].rect.X + (eyesDetected[0][0].rect.Width / 2)) / 2;

What I have understood is that every McvAvgComp struct stores a rect (area) where the object detected is(an eye). The array, I think, stores couples of MCvAvgComp structs (left and right eye) and the jagged array stores all possible pairs of eyes detected. Is that? How can I access to the pair of rects left an right?

Thank you.
Dumar