Secondly, the appendix of the paper can also include some detailed tables or charts of the original data. These data are usually the original data obtained by the author's research, which may be huge or complex and inconvenient to present directly in the text. Therefore, the author can choose to put these raw data in the appendix for readers' reference.
In addition, the appendix of the paper can also include some tools, software codes, calculation formulas or experimental designs used in the research. These appendices may not be necessary for readers, but for those who are interested in research tools and methods, these additional materials can provide more opportunities for reference and understanding.
In short, various documents can be attached to the appendix of the paper, including specific data, charts, images, detailed tables or graphs of original data, tools, software codes, calculation formulas used in research or experimental design, etc. In the form of appendix, the author can provide more relevant information and data support to enhance the readability and credibility of the paper.