| Octet No. | Contents |
| 10 | Parameter category (see Code Table 4.1) |
| 11 | Parameter number (see Code Table 4.2) |
| 12 | Type of generating process (see Code Table 4.3) |
| 13 | Background generating process identifier (defined by originating center) |
| 14 | Analysis or forecast generating processes identifier (defined by originating center) |
| 15-16 | Hours after reference time of data cutoff (see Note 1, below) |
| 17 | Minutes after reference time of data cutoff |
| 18 | Indicator of unit of time range (see Code Table 4.4) |
| 19-22 | Forecast time in units defined by octet 18 |
| 23 | Type of first fixed surface (see Code Table 4.5) |
| 24 | Scale factor of first fixed surface |
| 25-28 | Scaled value of first fixed surface |
| 29 | Type of second fixed surface (see Code Table 4.5) |
| 30 | Scale factor of second fixed surface |
| 31-34 | Scaled value of second fixed surface |
| 35-36 | Year of time of end of overall time interval |
| 37 | Month of time of end of overall time interval |
| 38 | Day of time of end of overall time interval |
| 39 | Hour of time of end of overall time interval |
| 40 | Minute of time of end of overall time interval |
| 41 | Second of time of end of overall time interval |
| 42 | n - Number of time range specifications describing the time intervals used to calculate the statistically processed field |
| 43-46 | Total number of data values missing in statistical process |
| 47-58 Specification of the outermost (or only) time range over which statistical processing is done | |
| 47 | Statistical process used to calculate the processed field from the field at each time increment during the time range (see Code Table 4.10) |
| 48 | Type of time increment between successive fields used in the statistical processing (see Code Table 4.11) |
| 49 | Indicator of unit of time for time range over which statistical processing is done (see Code Table 4.4) |
| 50-53 | Length of the time range over which statistical processing is done, in units defined by the previous octet |
| 54 | Indicator of unit of time for the increment between the successive fields used (see Code Table 4.4) |
| 55-58 | Time increment between success fields, in units defined by the previous octet (see Notes 3 and 4, below) |
| 59-nn These octets are included only if n > 1, where nn = 46 + 12 * n | |
| 59-70 | As octets 47 to 58, next innermost step of processing |
| 71-nn | Additional time range specifications, included in accordance with the value of n. Contents as octets 47 to 58, repeated as necessary |