app/scripts/logarithmic/logarithmic.directive.html
<span ng-hide='lc.mobile' class="interface-visible interface-clickable ewa-checkbox">
<!--
Logarithmic?
<input type="checkbox" ng-model="lc.logarithmic">
-->
<button ng-click="lc.toggleLogarithmic()" class="icon-big log-icon" ng-class="{active: lc.logarithmic}" title="Logarithmic"></button>
</span>