Particle IDs lower than -6

In the printout of the properties of transported particles stored in the common block TRACKR I noticed that the identity number of the particle (variable Jtrack) can be lower than -6. Which particles carry this label and where can I find their properties?

These particles are heavy fragments (heavier than 4He). When detailed transport for ions is activated, the “currently transported” ion/fragment properties are -almost always- cloned into the PART, PAPROP and THRSCM commons at index -2, in addition to its storage in common block FHEAVY under index abs(JTRACK).