def get_meas_los(self, user_lo_config):
try:<EOL><INDENT>_m_los = self.default_meas_los.copy()<EOL><DEDENT>except KeyError:<EOL><INDENT>raise PulseError('<STR_LIT>')<EOL><DEDENT>for channel, lo_freq in user_lo_config.meas_lo_dict().items():<EOL><INDENT>_m_los[channel.index] = lo_freq<EOL><DEDENT>if _m_los == self.default_meas_los:<EOL><INDENT>return None<EOL><DEDENT>return _m_los<EOL>
Embed default meas LO frequencies from backend and format them to list object.
        If configured lo frequency is the same as default, this method returns `None`.

        Args:
            user_lo_config (LoConfig): A dictionary of LOs to format.

        Returns:
            list: A list of meas LOs.

        Raises:
            PulseError: when LO frequencies are missing.