The document is a diagram showing the standard hexaxial reference system used in electrocardiography. It depicts the six leads (I, II, III, aVR, aVL, aVF) arranged around the heart at different angular positions, with lead I at 0 degrees as the reference point and the other leads labeled at their respective angular displacements.

1. EJE HEXAXIAL
aVF
II -90° III
-120° -60°
AvL
-150°
-30°
aVR
180°I 0° I
150° 30° aVR
aVL 120°
III 90aVF 60° II