Yokogawa 415 Steam and Gas - Manual (Page 36)

During Calibration, the program requires the user to input a frequency and the
Scaling Factor (K-factor of the flowmeter) at up to 10 points on the curve.
Generally these points will correspond to those shown on the Certificate.
If any frequency is set to 0Hz (Frequency 6 in the preceding example), then the
program will require no further correction points to be programmed. Hence, the
user can program any number of correction points up to a maximum of 10. Note
that if all 10 correction points are required, then Frequency 10 will automatically
be assigned the value of 0Hz.
34 Operation