#   Copyright 2020 AUI, Inc. Washington DC, USA
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.

def _normalize(direction, normtype):
    """
    PB normalization on the cubes

    direction : 'forward''reverse'
    normtype : 'flatnoise','flatsky','common','pbsquare'

    Multiply and/or divide by PB models, accounting for masks/regions.

    """