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I have a list of times in one column. They are formatted as Time cells. When I simply select the values and click Insert -> Line (diagram), I can't seem to get the right kind of diagram.

enter image description here

What causes this?

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You only have 1 column and no data range. What did you expect? – Ben Welman Feb 24 '13 at 13:06
There has to be something else wrong too. Checking the sum of the seven first results in 15:30. – MikkoP Feb 24 '13 at 13:13
even if formatted as time, it the value might include a date - and if that differs by a day, this might explain the strange outlier. for test purposes, change the format to date with time and see if the days are different... – Peter Albert Feb 24 '13 at 19:08

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