def _inside_contour(pos, contour):
    """Aux function"""
    npos = len(pos)
    x, y = pos[:, :2].T

    check_mask = np.ones((npos), dtype=bool)
    check_mask[((x < np.min(x)) | (y < np.min(y)) |
                (x > np.max(x)) | (y > np.max(y)))] = False

    critval = 0.1
    sel = np.where(check_mask)[0]
    for this_sel in sel:
        contourx = contour[:, 0] - pos[this_sel, 0]
        contoury = contour[:, 1] - pos[this_sel, 1]
        angle = np.arctan2(contoury, contourx)
        angle = np.unwrap(angle)
        total = np.sum(np.diff(angle))
        check_mask[this_sel] = np.abs(total) > critval

    return check_mask
dataset/ETHPy150Open mne-tools/mne-python/mne/viz/topomap.py/_inside_contour/original