Day wise diurnal plot not the average diurnal plot

I'm not entirely sure what you want to do, but be aware that you can use wave subranges for plotting. If you wanted to plot Al for Jan 14th (if I understand your data correctly) you could execute:

A neat little thing to know is the feature dimension labels, i.e.

If employed, you could make the code more readable:

 If you want to split the dataset use e.g.

Thanks ChrLie! I want to plot everyday diurnal  i.e. 0 to 24 hr from Jan 14 until Feb 9, for Al in a plot and do the same for other elements. I do not want to execute the codes (you have mentioned above ) several times for each day by AppendToGraph but to write a procedure code to execute it and produce these graphs. I hope this is clear now.

The difficult part is to organize your data day-wise because your input wave is not regularly spaced.

However, if your data is split into individual days you can use something like:

 Then call it from the command line, e.g.

Thank again! I will do it for some elements suggested by you but still it seems a bit of manual work. Indeed, I do not have systematic time series. Let's see if I get some more comments.