def get_channels(self):
        """Get the selected channel(s in order).

        Returns
        -------
        list of str
            name of each channel (without group), in original record order
        """
        selectedItems = self.idx_chan.selectedItems()
        selected_chan = [x.text().split('—')[0] for x in selectedItems]
        chan_in_order = []
        for chan in self.one_grp['chan_to_plot']:
            if chan in selected_chan:
                chan_in_order.append(chan)

        return chan_in_order
Get the selected channel(s in order).

        Returns
        -------
        list of str
            name of each channel (without group), in original record order