I have this graph and I want to describe the difference in the take off trajectory of two patterns in the figure below. The first pattern is seen in the first two parameters over the years from the left. The second pattern is seen in the next 4 parameters. I wanted to describe the beginning part of these two patterns. How to describe this using appropriate phrases?
The first two parameters (a and b) took off faster than the next 4 parameters (c, d, e and f).
The 4 parameters (c, d, e and f) showed a modest take off compared with the first two (a and b).
While A and B showed a sharp incremental trajectory, the initial slope was rather shallow for C, D , E and F.