isobaricInhPa是一个标量坐标，所以不适合我。如果我删除它，我无法重现结果，我两次都得到正确的结果。sel

First of all thanks for your answer. In fact, this was originally a vector coordinate, but I chose one to send u. This time I upload a version of isobaricInhPa which is a vector coordinate, please select.

The latitude should be 73 but 72 ,but,when I try to check latitude by itself, it works fine again, which makes me think it's a bug. ``` import xarray as xr data3 = xr.open_dataset('test0001.nc')

correct

a = data3.sel(time='1979-1',isobaricInhPa=200).z[:, ::10,::10]

The latitude should be 73 but 72

wrong (latitude wrong,latituede is 72)

b = data3.sel(time='1979-1',isobaricInhPa=200).z[:, ::-10,::10]

correct(latitude wrong,latituede is 73)

b = data3.sel(time='1979-1',isobaricInhPa=200).z[:, ::-10,::10].latitude ```

latitude should be 73, but this is 72, and the coordinates do not correspond to the data

test0001.zip

It seem that when use sel() , [: , ::-1 , :] and [: , ::10 , ::10] at the same time will cause the second coord will wrong like this.

Why just when use sel and[: , ::-10 , ::10] ,it will goes wrong( the coordinates DO NOT correspond to the data) , but use sel and[: , ::10 , ::10] it goes right (the coordinates DO correspond to the data)? data3.sel(time='1979-1',isobaricInhPa=200).z[:, ::10,::10][: ,::-1,:] #works wrong data3.sel(time='1979-1',isobaricInhPa=200).z[:, ::10,::10][: ,::1,:] #works right I think this is a bug.