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I want to make a smooth line graph with x and y values but i can't get it to work correctly

Solved by S. L. in 17 mins

i am plotting a scatter graph with smooth lines of average data against time, i would like to add a standard deviation line parallel to the average but not as an error bar

Solved by M. Q. in 29 mins

The trend line is not fitting by data close enough to what I would like. I want to graph the data using a scatter with smooth lines (or some other method) and be able to hover over the graph at specific point to see the x & y coordinates. My main objective is to get y values for every 5 minutes (x values).

Solved by I. J. in 26 mins

horizontal line on a graph horizontal line on a graph

Solved by D. H. in 19 mins

I need to add a line to a chart, not a spark line, the line graph will be used with a BAR graph. The bar graph represents work done and the line is the work left to do (burn down)

Solved by C. F. in 13 mins