p'>)</span><span class='hljl-t'>
        </span><span class='hljl-n'>du</span><span class='hljl-p'>[</span><span class='hljl-ni'>3</span><span class='hljl-p'>]</span><span class='hljl-t'> </span><span class='hljl-oB'>=</span><span class='hljl-t'> </span><span class='hljl-n'>R</span><span class='hljl-oB'>+</span><span class='hljl-p'>(</span><span class='hljl-n'>rfrac</span><span class='hljl-oB'>+</span><span class='hljl-n'>rfrac_noise</span><span class='hljl-p'>)</span><span class='hljl-t'>
    </span><span 