0 0 NO CHANGE
1 1 CUMULIFICATION
2 2 SLOW ELEVATION
3 3 RAPID ELEVATION
4 4 ELEVATION AND STRATIFICATION
5 5 SLOW LOWERING
6 6 RAPID LOWERING
7 7 STRATIFICATION
8 8 STRATIFICATION AND LOWERING
9 9 RAPID CHANGE
15 15 MISSING VALUE