Thanks @PlanetGus and @chhei-s for your replies.
I have some -B[…] options as well as -B[…]g[…]. I attached below the lines where i have it (i’m using grdview after blockmean and surface):
gmt subplot begin 1x2 -M0.1c -Fs8c/0 -R28/43/-28/-10 -JM8c -SCb -SRl+t -Bwesn
gmt grdview block.nc -Ccontinuous.cpt -Qs -B+t"T2" -c0,1
gmt colorbar -Dx6.85c/4.35c+w4c/.18c+jTC+e -F+gwhite -Ccontinuous.cpt -B100g25
-B+tcontinuous -Bx -By+lmm
The -n+a option doesn’t seem to work with grdview, or should it be placed with some other command?
Thank you for the help.
Cheers,
João Rocha