code: def main(graph: BELGraph, xlsx: str, tsvs: str):
      
      if not xlsx and not tsvs:
          click.secho('Specify at least one option --xlsx or --tsvs', fg='red')
          sys.exit(1)
  
      spia_matrices = bel_to_spia_matrices(graph)
  
      if xlsx:
          spia_matrices_to_excel(spia_matrices, xlsx)
  
      if tsvs:
          spia_matrices_to_tsvs(spia_matrices, tsvs)
docs: Export the graph to a SPIA Excel sheet.