# A tibble: 6 x 5
     gx    gy meanelev  convex slope
  <dbl> <dbl>    <dbl>   <dbl> <dbl>
1   300   380     387. -0.36   15.7 
2   300   400     383. -0.715  13.7 
3   300   420     381. -0.5     8.96
4   300   440     380. -0.122   5.90
5   300   460     377. -0.0700 11.0 
6   300   480     374. -0.197  11.7 
