如何删除FedEx ZPL标签中的空白？

Question

我在我们的应用程序中使用FedEx Web服务。 Web服务响应中收到的FedEx标签。标签向下打印，标签顶部有空白。

        request.RequestedShipment.LabelSpecification = new LabelSpecification();
        request.RequestedShipment.LabelSpecification.ImageType = ShippingDocumentImageType.ZPLII; 
        request.RequestedShipment.LabelSpecification.ImageTypeSpecified = true;
        request.RequestedShipment.LabelSpecification.LabelFormatType = LabelFormatType.COMMON2D;
        request.RequestedShipment.LabelSpecification.LabelStockType = LabelStockType.STOCK_4X6;

Label Img

如何删除空白？