The sections within a C3D file contain information stored in records. This manual will consistently use the term record to describe a unit of data storage within the C3D format. In this context, the term record should be seen more in the terms of database usage than a file structure.
Thus, all C3D files contain a header record (i.e. the header section), parameter records are stored within the parameter section, and data records (3D and/or analog) are stored within the data section etc.