Well, I do seem to be making some headay in this problem, albeit slowly.. So far, Ive created a Gnumeric spreadsheet populated with 3 column and 8928 lines of data. if I highlight all this, and click on 'Insert a chart', I get a box, which at first makes no sense. I click on 'line', since I want a line graph. . Select 'unmarked line plot', since I don't want markers. The the first breakthrough. If I click on 'Use first series as shared absissa' and the thing starts to make sense. The axes swing to place the data in column A (date0, as the absissa, and columns B and C (time and temperature) as the ordinate. Having, at last attained a logical structure I can go 'Forward' and insert the chart into the spreadsheet. Back to the spreadsheet I can now begin to organise the data, and the appearance. I have a graph of the temperature against the date, which is what I was after. With another of the time against the date, which is irrelevant, and which I shall delete. The next bit is detail work to regularise the scales and overall values, set the colours, fonts titles and labels. Then go on to add rainfall as a bar chart I must have done this all before, but, over time, it must have been forgotten. If thiss is anything to go by, it was probably forgotten with some rlief. It does seem to be a very complicated and un-intuitive way to go about things. If it had been a manually drawn graph, the setting up would have taken just a few minutes.
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