Saving struct arrays to disk with 'save'

2013 3 21
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I have a cell array of structs (spline bases created in the curve fitting toolbox) that takes up no more than half a Mb in RAM (workspace reads 424524 bytes). I want to save this to disk but using the standard Matlab 'save' command produces a file >5Gb (yes, gigabytes!) in size?!
Surely there is a bug with the save procedure for this datatype to be so inefficient? any workarounds?
Cheers

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