A data frame describing four concave profiles along an x-Axis.
profiles
A data frame with 31 rows and 5 columns:
A sequence from 0 to 30 (x-Axis)
First concave profile (y-Axis): Concave down (positive slope)
Second concave profile (y-Axis): Concave down (negative slope)
Third concave profile (y-Axis): Concave up (positive slope)
Fourth concave profile (y-Axis): Concave up (negative slope)