Plot a barbell plot of the observed (blue) and simulated (red) groundwater elevations as listed in the pest .res file. This function requires that both a .res file and targpest.dat file are located in the PATH directory.
| 1 2 3 | pltpstbarbell(PATH = NA, MAIN = NA, colour = "#a3c4dc",
  colour_obs = "blue", colour_sim = "red", size_obs = 3,
  size_sim = 3, alpha = 0.6, size = 1, xlab = "", ylab = "")
 | 
| PATH | This is the full file path to the .res and targpest.dat files. They need to be located in the same directory. | 
| MAIN | This is text to be printed as the main figure title | 
| colour | the colour of the bar | 
| colour_obs | the colour of the observed groundwater elevation | 
| colour_sim | the colour of the simulated groundwater elevation | 
| size_obs | the size of the observed groundwater elevation | 
| size_sim | the size of the simulated groundwater elevation | 
| alpha | the level of transparency of the ends | 
| size | the size of the bar | 
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