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Urgent- Help with dot plot in scientific paper Watch

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    Hi,

    I've got a presentation this afternoon on a scientific paper but am very confused about one dot plot included (link below - graph C). Basically, in the plot on the far right, it shows values +/- standard deviation. However, the SD bars dont cover both points. From my understanding, SD with 2 points must be equal by definition as they are both equidistant from their mean.

    Is this true, or am i understanding this plot very wrongly?

    Many thanks

    J

    Link - https://postimg.org/image/qpt016sb5/
 
 
 
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