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Double Data Type
Double (double-precision floating-point) variables are stored as IEEE 64-bit (8-byte) floating-point numbers ranging in value from -1.79769313486231E308 to -4.94065645841247E-324 for negative values and from 4.94065645841247E-324 to 1.79769313486232E308 for positive values.
Note The Double data type can be converted to the Decimal data type, without encountering an OverflowExceptionerror.
The equivalent NGWS runtime data type is System.Double.