def _print_stream_parameters(self, values):
        """Print a coloured help for a given tuple of stream parameters."""
        cprint("{0}".format(*values), "magenta", attrs=["bold"])
        print("{4}".format(*values))
        cprint("  available formats:   {1}".format(*values), "blue")
        cprint("  mandatory selectors: {2}".format(*values), "red")
        cprint("  optional selectors:  {3}".format(*values), "green")
        print()