gap-filled-stats.png plot to fix

[jmzobitz]

• Is it better to use a different plot, same depth?
• Why is soil CO2 so bad at some of the sites?
• What is the filtering / flagging protocol used to make a plot
• Second plot: fix x axis.
• 1:1 plot of the very best data

[jmzobitz]

• [x] Is it better to use a different plot, same depth?
• [x] Why is soil CO2 so bad at some of the sites?
• [x] What is the filtering / flagging protocol used to make a plot
• [x] Second plot: fix x axis.
• [x] 1:1 plot of the very best data

[jmzobitz]

Made changes on the plot to better reflect the discussion - some of the items on the to-do list aren't applicable.