Interpretation of "Multiple Injection" trailer

[chhh]

Hi,
Could you please provide any hints on how to interpret "Multiple Injection" trailer? I schedule MSX scans and get different "string structures" in that trailer, e.g. what does that one mean?

Multiple Injection: ce:h ce:h mpx

It looks like "i" is injection without fragmentation, "h" is injection with fragmentation, that "ce: prefix - I have only now started seeing it sometimes.

Thank you,
Dmitry