D value Returns the conversion from °Brix to Density. T value Returns the conversion from °Brix to Soluble Solids. DEVICE_CORRECTION device_id, value Returns the corrected value for a device. DEVICE_CONSTANT device_id, name, value=None Obtains the value of the constant defined for a device. A analysis_code, alias=None Obtains the value of a given column (by default the result field) for an indicated analysis, from the same analysis sheet. XS_A analysis_code, alias=None, notebook_line=None Obtains the value of a given column (by default the result field) for an indicated analysis, from any analysis sheet. NL analysis_code, alias=None, notebook_line=None Obtains the value of a given field (by default the result field) for an indicated analysis, from the laboratory notebook. REFERENCE_VALUE fraction_type, product_type, matrix, analysis, target_field Obtains the value of a given field ('id', 'result' or alias) for the line matching 'fraction type', 'product type', 'matrix' and 'analysis' indicated.