def plane_to_sphere_car(az0, el0, x, y):
    """Deproject plane to sphere using plate carree (CAR) projection.

    The input (x, y) coordinates are unrestricted. The target point can likewise
    be anywhere on the sphere.

    Please read the module documentation for the interpretation of the input
    parameters and return values.

    Parameters
    ----------
    az0 : float or array
        Azimuth / right ascension / longitude of reference point(s), in radians
    el0 : float or array
        Elevation / declination / latitude of reference point(s), in radians
    x : float or array
        Azimuth-like coordinate(s) on plane, in radians
    y : float or array
        Elevation-like coordinate(s) on plane, in radians

    Returns
    -------
    az : float or array
        Azimuth / right ascension / longitude of target point(s), in radians
    el : float or array
        Elevation / declination / latitude of target point(s), in radians
    """
    return az0 + x, el0 + y