A sparkline is a tiny chart in a worksheet cell that provides a visual representation of data. Use sparklines to show trends in a series of values, such as seasonal increases or decreases, economic cycles, or to highlight maximum and minimum values. Position a sparkline near its data for greatest impact.
Add a Sparkline
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Select a blank cell at the end of a row of data.
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Select Insert and pick Sparkline type, like Line, or Column.
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Select cells in the row and OK in menu.
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More rows of data? Drag handle to add a Sparkline for each row.
Format a Sparkline chart
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Select the Sparkline chart.
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Select Design and then select an option.
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Select Line, Column, or Win/Loss to change the chart type.
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Check Markers to highlight individual values in the Sparkline chart.
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Select a Style for the Sparkline.
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Select Sparkline Color and the color.
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Select Sparkline Color > Weight to select the width of the Sparkline.
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Select Marker Color to change the color of the markers.
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If the data has positive and negative values, select Axis to show the axis.
Source: Microsoft