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# Non-map Projections

The linear projection comes in three flavors: linear, log10, and power (or exponential). The projection for the y-axis can be set independently from the x-axis. We will show examples of all three by first creating dummy data sets using gmtmath , a ``Reverse Polish Notation'' (RPN) calculator that operates on or creates table data:

    gmtmath -T0/100/1  T SQRT = sqrt.d
    gmtmath -T0/100/10 T SQRT = sqrt.d10

- Cartesian Linear Projection (-–Jx -–JX)
- Logarithmic projection
- Power projection
- Geographical linear projection
- Linear Projection with Polar () Coordinates (-–Jp -–JP)