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<p>Convert 1D index used to access flmn array to (el,m,n) harmonic indices.</p>
<dl class="section note"><dt>Note</dt><dd>Index ranges are as follows:<ul>
<li>el ranges from [0 .. L-1].</li>
<li>m ranges from [-el .. el].</li>
<li>n ranges from [-el' .. el'], where el' = min{el, N}</li>
<li>ind ranges from [0 .. (2*N)(L**2-N(N-1)/3)-1] for compact storage methods and from [0 .. (2*N-1)*L**2-1] for 0-padded storage methods.</li>
</ul>
</dd></dl>