[Plugin: NextGEN Gallery] [Plugin: NextGen Gallery] Slideshow SIZE spec

My first gallery: https://ventureout.caramiadesign.net/

I specified the size: [slideshow id=3 660px=width 310px=height]

but it reverts to (from firebug):

<div id="ngg-slideshow-3-47-1" class="ngg-slideshow" style="height:240px;width:320px;">

Am I missing something?

Thanks!

https://www.ads-software.com/extend/plugins/nextgen-gallery/