We have online the data sets used in the book DIFFERENTIAL EQUATIONS Graphics Models Data, by David Lomen and David Lovelock, Wiley, 1999, and the Arizona Mathematical Software program Twiddle (300K). The data sets can be seen graphically and then downloaded individually, or collectively in the form of a zip file (50K). [Twiddle contains these data sets.] They are listed here by properties, fields, and chapters.

• Decreasing: | Linear | Concave Up |
• Increasing: | Linear | Concave Up | Concave Down | Sigmoidal |
• Increasing and Decreasing: | Concave Up | Concave Down |