a><span class="lineno">   58</span>&#160;<span class="stringliteral">                &quot;enum&quot;: [</span></div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="stringliteral">                    &quot;exponential&quot;,</span></div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="stringliteral">                    &quot;linear&quot;</span></div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#1