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11.4 Soil ....................................................................................................................................................... 3411.5 Substrate ............................................................................................................................................. 6312 Soil Profile Database 6513 Data conventions, transfer procedures and database design 6613.1 Missing data, explicit zeros and explanatory notes ............................................................................ 6613.2 Database design and transfer ............................................................................................................. 6613.3 Reference profiles ............................................................................................................................... 7313.4 Spatial data.......................................................................................................................................... 7314 Relationship to SOTER 7415 References 75Appendix 1: Conversion for pH in water to pH in CaCl 2 79Appendix 2: Updates to the <strong>Technical</strong> <strong>Specifications</strong> 80