Does the journal allow authors to add appendices or supplementary data?

Yes, most academic journals permit authors to include appendices or supplementary data. This practice is generally encouraged to enhance transparency and provide detailed supporting information without overwhelming the main article. Appendices typically contain essential material directly referenced in the main text, such as extensive tables, detailed methodologies, or lengthy proofs, often included within the final published document. Supplementary data usually refers to additional, non-critical elements like raw datasets, extensive image sets, code, or lengthy interviews, submitted alongside the manuscript but hosted separately by the journal. Authors must strictly adhere to the specific journal's guidelines regarding acceptable formats, size limits, ethical considerations, and the submission process. Crucially, supplementary data should not be essential for understanding the core findings presented in the main manuscript. Supplementary materials provide vital evidence supporting reproducibility, offer extended analysis, and share resources beneficial for the research community. Authors use them to share comprehensive datasets, detailed experimental protocols, or extensive results that would otherwise exceed article length restrictions. Properly referenced appendices and supplementary data significantly augment the article's credibility and utility for readers seeking deeper technical insights. Publishers routinely require supplementary data to be peer-reviewed and permanently linked to the main publication.