For instance, field 3 is Mean Radius, field 13 is Radius SE, field 23 is Worst Radius.

0 mean radius
1 mean texture
2 mean perimeter
3 mean area
4 mean smoothness
5 mean compactness
6 mean concavity
7 mean concave points
8 mean symmetry
9 mean fractal dimension
10 radius error
11 texture error
12 perimeter error
13 area error
14 smoothness error
15 compactness error
16 concavity error
17 concave points error
18 symmetry error
19 fractal dimension error
20 worst radius
21 worst texture
22 worst perimeter
23 worst area
24 worst smoothness
25 worst compactness
26 worst concavity
27 worst concave points
28 worst symmetry
29 worst fractal dimension