<div class="row">
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  <div class="col-md-12 text-center">
    <div class="btn-group btn-group-xs">
      <button ng-repeat="(value, text) in options track by $index"
              type="button" class="btn btn-default btn-default-outline"
              ng-style="{width: buttonWidth}"
              ng-class="{'btn-primary btn-primary-outline': value == ngModel}"
              ng-bind="text"
              ng-click="toggle(value)"></button>
    </div>
  </div>
</div>