_writedata_internal(self, fileobj)
TODO: Might be nice to store some indication of the data's byte order as an attribute or function so that we don't have to do this.
Basically copy/pasted from :None:None:`_ImageBaseHDU._writedata_internal()`, but we have to get the data's byte order a different way...
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SVG is more flexible but power hungry; and does not scale well to 50 + nodes.
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