Gravfft: Compute the deflections of the vertical due to flexure of the topography file

Hello stuff of GMT,
A very small result presented when I use gravfft to compute the deflections of the vertical due to flexure of the topography file. The code and result are as follows. Can someone help me?

gmt gravfft topo.grd -T4000/2700/3300/1035 -Na+d -Fe -Geast.grd

topo

east DOV

I don’t think -T can be used when computing the deflections. Use -D

… and please, don’t post screen-captures of text.

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Thanks for your help and remind, -D works for me.