Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Institution | Location | Year Joined | Affiliation | Enrollment | Mascot | Colors |
| --- | --- | --- | --- | --- | --- | --- |
| Aquinas | La Crosse, WI | 1997.0 | Private (Catholic) | 330.0 | Blugolds | Blue and Gold |
| Holmen | Holmen, WI | 1989.0 | Public | 1077.0 | Vikings | Maroon and White |
| Central | La Crosse, WI | 1989.0 | Public | 1316.0 | Red Raiders | Red and Black |
| Logan | La Crosse, WI | 1989.0 | Public | 1037.0 | Rangers | Red and White |
| Onalaska | Onalaska, WI | 1989.0 | Public | 907.0 | Hilltoppers | Purple and White |
| Sparta | Sparta, WI | 1989.0 | Public | 745.0 | Spartans | Red and Gold |
Question:
what is the affiliation of the hilltoppers mascot?
Answer:
Public