Define options
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@@ -33,7 +33,7 @@ ol.source.ZoomifyTierSizeCalculation = {
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*/
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ol.source.Zoomify = function(opt_options) {
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var options = goog.isDef(opt_options) ? opt_options : {};
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var options = opt_options || {};
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var size = options.size;
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var tierSizeCalculation = goog.isDef(options.tierSizeCalculation) ?
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