<span class='hljl-n'>I</span><span class='hljl-oB'>*</span><span class='hljl-n'>δt</span><span class='hljl-t'>
    </span><span class='hljl-n'>ifrac_noise</span><span class='hljl-t'> </span><span class='hljl-oB'>=</span><span class='hljl-t'> </span><span class='hljl-nf'>sqrt</span><span class='hljl-p'>(</span><span class='hljl-n'>ifrac</span><span class='hljl-p'>)</span><span class='hljl-oB'>*</span><span class='hljl-nf'>rand</span><span class='hljl-p'>(</span><span class='hljl-nf'>Normal</span><span class