| increment | float | The increment along this axis | Hz |
| length | int | The length of this axis | |
| maximumValue | float | The maximum value along the Axis | MHz |
| minimumValue | float | The minimum value along the Axis | MHz |
| name | str | The name of this axis | |
| number | int | The number (order) of this axis | |
| referencePixel | float | The reference pixel | pixel |
| referenceValue | float | The value at the reference pixel | MHz |
| units | str | The units of this axis | |
