After the balloon burst, the level of ozone is estimated by using the equation below with a constant mixing ratio (p3i = p3i+1 = p3END) up to ambient pressure 0 hPa. The equation changes to:
When the pressure is given in hPa, the equation above gives the residual total ozone in DUs.
The total ozone can now be calculated from the equation:
Another option is introduced in the GAW report 201. Post-calculation is possible, integrated ozone is reported, and residual can be calculated afterwards. It can also be changed in the script.