This projection uses and allows us to explore exponential relationships like x versus y. While and can be any values, we will select and which means we will plot versus . We indicate this scaling by appending a p (lower case P) followed by the desired exponent, in our case 0.5. Since we do not need to specify p1 since it is identical to the linear transformation. Thus our command becomes
psxy -R0/100/0/10 -Jx0.3ip0.5/0.15i -Ba1p/a2f1WSne -W1p -P -K sqrt.d > GMT_pow.ps psxy -R -Jx -Sc0.075i -Gwhite -W -O sqrt.d10 >> GMT_pow.ps