Set the vAxis or hAxis's (depending on which you want to format) format 
property to something like "#.###", ie:

vAxis: {
    format: '#.###' // show axis values to 3 decimal places
}

On Sunday, October 14, 2012 10:50:52 PM UTC-4, Wells Oliver wrote:
>
> Is it possible to specify the precision of floating point values in graph 
> axes? I'd like the values shown to three points but I can't seem to force 
> this.
>
> Thanks.
>

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