Get an array of numbers from a netcdf file using xarray

I can open a netdcf file with xarray. Then, get a slice of a varible (wrfout_zz_tavg) in the netcdf file. When I try to print this variable, it gives me some extra details (like coordinates and etc.). How can I get just an array of float numbers with no more details?

Here is my code:

import xarray as xr
fin = xr.open_dataset("test.nc")
zz_tavg = fin.wrfout_zz_tavg
slice_zz = zz_tavg[0:28,77,23]
print(slice_zz)

This is my screen output:

<xarray.DataArray 'wrfout_zz_tavg' (bottom_top: 28)>
array([1267.2994, 1320.5454, 1378.9381, 1442.8959, 1512.8885, 1589.4257,
       1673.0416, 1764.3097, 1863.855 , 1972.3475, 2090.519 , 2219.19  ,
       2359.26  , 2511.6719, 2677.3743, 2857.3916, 3052.9136, 3265.276 ,
       3495.9197, 3746.4136, 4018.517 , 4314.2246, 4635.806 , 4985.8716,
       5367.4385, 5783.9033, 6239.008 , 6736.876 ], dtype=float32)
Coordinates:
    XLAT     float32 ...
    XLONG    float32 ...
Dimensions without coordinates: bottom_top

What I want to get is:

      [1267.2994, 1320.5454, 1378.9381, 1442.8959, 1512.8885, 1589.4257,
       1673.0416, 1764.3097, 1863.855 , 1972.3475, 2090.519 , 2219.19  ,
       2359.26  , 2511.6719, 2677.3743, 2857.3916, 3052.9136, 3265.276 ,
       3495.9197, 3746.4136, 4018.517 , 4314.2246, 4635.806 , 4985.8716,
       5367.4385, 5783.9033, 6239.008 , 6736.876 ]