Metals are extracted using magnetic separators, air flotation separator columns, shaker tables or eddy currents. The two types are electrodynamic separators (or high tension rollers) or electrostatic separators. There are two main types of electrostatic separators. Separators, such as commas, are not used to group numbers. Two popular separators are the space character and the comma. Pico lacks return statements, and uses semicolons as statement separators instead of terminators. The feedwater subcools the saturated water from the moisture separators. The steam collected in the separators was vented separately from the liquid coolant. Fields are packed into records without field separators or record terminators. In the industrial production of cream, this process is accelerated by using centrifuges called "separators". Below are some of the ways in which oil is separated from gas in separators. Early auto batteries used hard rubber cases and wooden plate separators. In addition to polymer separators, there are several other types of separators. They are used as laser harmonic separators. They are referred to as oil-grit separators (OGS) or oil-sediment separators (OSS).