msgStockPrint: prtCont1 (print condition) field - SpiderRock/SRDataFeed GitHub Wiki
PrintCond1 is the the equity SIP condition code.
This can either be the UTP code or the CTA code.
'@' is the UTP regular condition code, ' ' is the CTA regular condition code.
The additional fields (PrintCond2, PrintCond3, PrintCond4) contain information for long print messages. Otherwise only the first field has a value, and the other fields are left blank.
For full details, see:
Page 42: https://www.utpplan.com/DOC/UtpBinaryOutputSpec.pdf
Page 64: https://www.ctaplan.com/publicdocs/ctaplan/CTS_Pillar_Output_Specification.pdf