In case any reader of this Quadripedia finds any mistake, typo or miss, please report to joancarles.artes@uab.cat.

Also, if any researcher produces a new paper with phase portraits and wants to use the database to compare his/er new results with the old ones, you can do it freely. We beg you to send us a copy of your paper plus the set of lines introduced in the database by you so to confirm your results, add your data to the global database and to the Quadripedia. And we are even more interested if you have found some new phase portrait not yet present in the Quadripedia.