I’ve a google charts loading data from json but it is duplicatin the rows and i don’t know why. (see image)
My code is hosted here: http://jsfiddle.net/seinoxygen/U5Mqw/
I really can’t figure why 🙁

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Your problem is that when you’re actually setting the format parameter to “#”, the labels are being rounded to the nearest number, so bringing duplicates.
Maybe you should change the format. I did look around for a way to configure how many labels are shown but didn’t find it.
I did find this question, which kinda dwells into your problem… but it is still not an elegant solution.