The freespace pointers (represented by F's) can or cannot exist in the control interval. These pointers are used to point to control intervals in the data component that are not being used in this control area. (Each sequence set CI owns one specific control area in the data component.) A field in the header information governs the length of each of these pointers. The column at the side of the graph labeled FREE PTRS is the number of free pointers found in the sequence set record. This is an actual count, and not the number of characters needed to hold the pointers. Therefore, this count represents the actual number of control intervals in the data component's control area that are not being used. We will discuss freespace pointers in more detail in a little while.
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