α0	Baseline concentration
Ca	Calcium concentration (samples)
Mg	Magnesium concentration (samples)
Cr	Chromium concentration (samples)
ɛ	Joint error of analysis and sampling for valid observations
i	Index for grid cells
jlow	Index for low observations (in a given grid cell)
jvalid	Index for valid observations (in a given grid cell)
λi	The local spatial random effect
mi	Number of neighbors for a grid cell i
μi	Mean of all observations in a grid cell i; interpolated concentration ≡ exp(μi)
μɛi,jvalid	Mean of all observations in a grid cell i including measurement error term for a valid observation jvalid
μɛi,jlow	Mean of all observations in a grid cell i including error probability distribution for a low observation jlow
τ	Common precision for the log-normal distributions in each grid cell
τCAR	Overall spatial precision
τi,jvalid	Measurement error precisions of valid observations

“Observations” is defined here as Ca, Mg, or Cr.