between(x, left, right) is the same as x >= left & x <= right

between(x, left, right) is the same as x >= left & x <= right, which means you can use it to filter for specific parts of your data! For instance, for my C_i* A-C_i data, I need to filter for just the initial slopes of each A-C_i response measured at a different PAR.

cstar_aci_data <- aci_data %>%
  filter(Obs %>% between(4, 8) |
           Obs %>% between(20, 25) |
           Obs %>% between(29, 34) |
           Obs %>% between(38, 43) |
           Obs %>% between(47, 52))