gnuplot把原始表格数据转换为图形文件。

Gnuplot converts raw tabular data into a graphic file image.

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该方法返回一个可以在以后保存到输出文件的字节数组；取决于请求的格式，输出文件可以是图形文件或Excel电子表格。

This method returns a byte array which you can then save to an output file, such as an image file or an Excel spreadsheet, depending on the requested format.

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