Accurate and reliable gas measurement depends on a combination of efforts from two groups of people. First, we have the field personnel. They have the responsibility of seeing that a readable chart is produced and that all information pertinent to volume calculation is supplied to our next group, which is the office personnel. This group will read the chart, apply information supplied by the field, calculate the amount of gas delivered, and generate and deliver volume statements to the customer. It must be recognized that the office group can not calculate volumes until it receives the charts and other required data from the field, and that the volumes are only as accurate as the data received