pan class='hljl-n'>I</span><span class='hljl-oB'>+</span><span class='hljl-p'>(</span><span class='hljl-n'>ifrac</span><span class='hljl-oB'>+</span><span class='hljl-n'>ifrac_noise</span><span class='hljl-p'>)</span><span class='hljl-t'> </span><span class='hljl-oB'>-</span><span class='hljl-t'> </span><span class='hljl-p'>(</span><span class='hljl-n'>rfrac</span><span class='hljl-t'> </span><span class='hljl-oB'>+</span><span class='hljl-t'> </span><span class='hljl-n'>rfrac_noise</span><span class='hljl-