# A tibble: 6 x 5
     gx    gy meanelev  convex slope
  <dbl> <dbl>    <dbl>   <dbl> <dbl>
1     0     0     123. -0.315  13.3 
2     0    20     125.  1.21   17.9 
3     0    40     129.  0.0975  9.65
4     0    60     130. -0.132  10.9 
5     0    80     132.  0.0975 11.9 
6     0   100     133.  0.103  11.0 
