>> >  I was wondering how much I could reduce the file size of your PNG if
>> > lossiness is allowed, but without degrading the image quality 
>> > noticeably.
>> > I was able to reduce your original 138408 bytes png to a 49074 bytes 
>> > one:
>
>> The AA on the diagonal lines certainly looks noticeably worse...
>
>  I don't think it reduces the readability and clarity of the graph in
> any way.

Me neither, but it certainly is noticeable.  I wonder if you use just 
horizontal and vertical lines, rather than diagonal lines, and don't use 
rounded boxes, or a coloured background, or AA text, how that would affect 
the file size?

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