Gets the pressureGroup attribute of the SSITable object
*
* @param depth Description of the Parameter
* @param time Description of the Parameter
* @return The pressureGroup value
Gets the pressureGroup attribute of the NAUITable object
*
* @param depth Description of the Parameter
* @param time Description of the Parameter
* @return The pressureGroup value
Gets the pressure group after a surface interval, given a starting pressure group
*
* @param pg Pressure group before the surface interval
* @param time Time spent on the surface
* @return The new pressure group after the surface interval
Gets the pressure group after a surface interval, given a starting pressure group
*
* @param pg Pressure group before the surface interval
* @param time Time spent on the surface
* @return The new pressure group after the surface interval