Gnuplot produces SVG images with text labels:
<g transform="translate(195.1,140.6)" stroke="none" fill="black" font-family="Arial" font-size="8.00" text-anchor="middle">
<text><tspan font-family="Arial" >1</tspan></text>
</g>
These labels aren't correctly aligned.
If the code is changed manually by deleting the tspan object and moving the text anchor attribute from the g object to the text object, then it is rendered correctly by the image region.
<g transform="translate(271.7,140.6)" stroke="none" fill="black" font-family="Arial" font-size="8.00">
<text text-anchor="middle" font-family="Arial" >3</text>
</g>
