def METHOD_NAME(self):
    """Initialize channels."""
    rows = 5
    cols = 10
    self.c01 = xr.DataArray(da.zeros((rows, cols), chunks=25) + 0.20, dims=('y', 'x'), attrs={'name': 'C02'})
    self.c02 = xr.DataArray(da.zeros((rows, cols), chunks=25) + 0.30, dims=('y', 'x'), attrs={'name': 'C03'})
    self.c03 = xr.DataArray(da.zeros((rows, cols), chunks=25) + 0.40, dims=('y', 'x'), attrs={'name': 'C04'})