Question: How can I plot time difference versus numeric value?

acer helped me out last week with converting strings to dates which was very helpful. However now I stumble on 2 other problems:

- I do not succeed to plot DS6 (time difference versus a numeric value) and to not understand why

- in the cvs data sheet the length of the columns is not equal. The empty cells are automatical filled with "". This prevents me to use numelems as it will also take into consideration the cells filled with "". Is there a way to prevent this

As usual I would like to thank you all, power users, for your patience and help

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