# CODE TABLE 4.10, Type of statistical processing
0 avg  Average
1 accum  Accumulation
2 max  Maximum
3 min  Minimum
4 diff  Difference (value at the end of time range minus value at the beginning)
5 rms  Root mean square
6 sd  Standard deviation
7 cov  Covariance (temporal variance)
8 8  Difference (value at the start of time range minus value at the end)
9 ratio  Ratio
# 10-191 Reserved
# 192-254  Reserved for local use
255 missing  Missing