Sumatra detection limits

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During preparation of the CD-ROM the data has also been "cleaned" by replacing all 0 (below detection values) with a value 2/3rds the reported detection limits (rounded to an integer) i.e.

Element Detection Limit(ppm) Value substituted
Cu 2 1
Pb 5 3
Zn 5 3
Co 2 1
Ni 5 3
Mn 50 30
Ag 1.0 0.7
Li 1 0.7
K 100 70
Cr 5 3
Fe 0.1% 0.07
As 1.0 0.7
Mo 0.5 0.3
Sn 10 7
W 2.5 1.7

Absent data in the database is represented by null values.