def maskAngLT452(image):
    """
    mask out angles >= 45.23993

    Parameters
    ----------
    image : ee.Image
        image to apply the border noise masking

    Returns
    -------
    ee.Image
        Masked image

    """
    ang = image.select(['angle'])
    return image.updateMask(ang.lt(45.23993)).set('system:time_start', image.get('system:time_start'))