Hello, so I was trying to get the coordinates for a 170 km contour using:
fig.grdcontour(grid='SLNAAFSA.nc', interval = +170, D = "contoursl.ll")
I thought by adding “+” it would give me just the 170 km contour, but the dump contoursl.ll file also includes contours for multiples of 170 (340, 510, 680 and 850 km). May I have some help with this?