1. tables:
1.1 chseq_homologs.csv: homologous dataset, coresponding to http://129.112.32.71/wenlin/pdb_survey2/index.cgi/pages/homologs/seed-extend
1.2 chseq_unrelated_loose.csv: unrelated dataset with loose criterion, coresponding to http://129.112.32.71/wenlin/pdb_survey2/index.cgi/pages/unrelated/middle-match
1.3 chseq_unrelated_stringent.csv: unrelated dataset with stringent criterion, coresponding to http://129.112.32.71/wenlin/pdb_survey2/index.cgi/pages/unrelated/seed-extend
for the details about the criterion, please read our manuscript

2. columns in tables:
2.1 No.: the number 
2.2 ch_sequence: the amino acid sequence appeared in pdb database
2.3 PDB_code: 4-digit access code in pdb database
2.4 chain: the chain of the structure
2.5 sequence_start: the starting index in the plain sequence
2.6 dssp: the secondary structure computed by dssp program for the chameleon sequence

Enjoy!