def drawSensor(sensor, SYSSIZE, ax):
    """Draw the sensor coordinates

    Parameters
    ----------
    sensor: Sensor
        Sensor to draw
    SYSSIZE : float
        Size of the display system
    ax : [pyplot]
        pyplot canvas to draw on

    """
    from magpylib._lib.mathLib import angleAxisRotation
    M = angleAxisRotation([1, 0, 0], sensor.angle, sensor.axis)
    P = sensor.position
    ax.quiver(P[0], P[1], P[2], M[0], M[1], M[2], normalize=True, length=
        SYSSIZE / 4, color='r')
    ax.text(M[0] + P[0], M[1] + P[1], M[2] + P[2], 'x', None)
    M = angleAxisRotation([0, 1, 0], sensor.angle, sensor.axis)
    ax.quiver(P[0], P[1], P[2], M[0], M[1], M[2], normalize=True, length=
        SYSSIZE / 4, color='g')
    ax.text(M[0] + P[0], M[1] + P[1], M[2] + P[2], 'y', None)
    M = angleAxisRotation([0, 0, 1], sensor.angle, sensor.axis)
    ax.quiver(P[0], P[1], P[2], M[0], M[1], M[2], normalize=True, length=
        SYSSIZE / 4, color='b')
    ax.text(M[0] + P[0], M[1] + P[1], M[2] + P[2], 'z', None)
