# Make a CPT from start to end year gmt makecpt -Cviridis -T2020/2025/0.1 -Z > time.cpt
Assume you have a dataset exported as lon lat depth (depth in meters, negative down).
# 1️⃣ Convert to GMT grid (optional) gmt surface depth.prn -R-70/-60/30/40 -I0.1m -Gbathymetry.nc
# Make a CPT from start to end year gmt makecpt -Cviridis -T2020/2025/0.1 -Z > time.cpt
Assume you have a dataset exported as lon lat depth (depth in meters, negative down).
# 1️⃣ Convert to GMT grid (optional) gmt surface depth.prn -R-70/-60/30/40 -I0.1m -Gbathymetry.nc
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