h parameters </span>
<span class="sd">                                     (n, sig, scaling and noise) </span>
<span class="sd">                                     for the Naka-Rushton function: </span>
<span class="sd">                                    | NK(x) = sign(x) * scaling * ((abs(x)**n) / ((abs(x)**n) + (sig**n))) + noise</span>
<span class="sd">                                       </span>
<span class="sd"> :cam18sl(): | calculates the output for the CAM18sl model for self-luminous related sti