New to Java

Hi,

I have a piece of code as follows. How can I write the necessary parts in CO2, N2O, NH3, etc. as a subscript?

Thanks.

Properties props = new Properties();
props.put("plot/coordinateSystem/xAxis/ticLabelFormat/map", "0=CO;1=NOx;2=CH4;3=N2O;4=NH3");