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(Try to post the error messages too. It helps in debugging)
The offending command "chnfobj.getdata()" change it to "chnfobj.get_data()"
I also commented:
#axes.set_ylim([0.6,1.2])
since I do not know if chan 6 is or not a voltage channel. Now I got a plot.
To know the channel type, print the array chanid (giving in dictionary format) first then in a second pass, plot your selected channels accordingly to their type (set the y-axis range as needed).