
def GetNTC2008():
    """ Retrieves the definition of a NTC2008 response spectrum function """ 
    pass

def GetNTC2018():
    """ Retrieves the definition of a NTC 2018 response spectrum function"""  
    pass

def SetNTC2008():
    """ Defines a NTC2008 response spectrum function"""
    pass

def SetNTC2018():
    """ Defines a NTC 2018 response spectrum function"""  
    pass
