******************* This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address. ******************* Dear all, I wonder the options of the C0Projection module. Could you please help me with it? First, the option 'localtoglobalmap' is cheap to perform. However, sometimes it may cause some interpolation problems, leading to a different result compared with the expansive default one. I want to know which option is better for the precision of results? Second, since the value of Q-Criterion and vorticity is very high near the wall region, which may cause inconvenience when post-processing, will the option 'usexmlbcs' improve it? I will be very grateful with your kind reply. Many thanks, Zhaoyu Wang Shanghai Jiao Tong University