issues: 528059041

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
528059041 MDU6SXNzdWU1MjgwNTkwNDE= 3569 Drawing only one contour in FacetGrid 6815953 closed 0     1 2019-11-25T12:37:02Z 2020-04-11T16:11:52Z 2020-04-11T16:11:52Z NONE      

MCVE Code Sample

```python import numpy as np import matplotlib.pyplot as plt import xarray as xr

x, y = np.meshgrid(np.arange(12), np.arange(12)) z = xr.DataArray(np.sqrt(x2 + y2)) z2 = xr.DataArray(np.sqrt(x2 + y2)+1) ds = xr.concat([z,z2], dim = 'time') ds['time'] = [0,1]

f, ax = plt.subplots() ds[0].plot.contour(ax = ax, levels=[4], colors=['k']) f, ax = plt.subplots() ds[1].plot.contour(ax = ax, levels=[4], colors=['k']) ds.plot.contour(col = 'time', levels=[4], colors=['k']) ```

Output

Expected Output

Problem Description

While drawing only one contour was fixed some time ago (#866), single contour plots in FacetGrid do not work for me.

Output of xr.show_versions()

INSTALLED VERSIONS ------------------ commit: None python: 3.6.8 (default, Oct 7 2019, 12:59:55) [GCC 8.3.0] python-bits: 64 OS: Linux OS-release: 4.15.0-65-generic machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_US.UTF-8 LOCALE: en_US.UTF-8 libhdf5: 1.10.2 libnetcdf: 4.6.3 xarray: 0.14.1 pandas: 0.24.2 numpy: 1.17.3 scipy: 1.2.1 netCDF4: 1.5.1.2 pydap: installed h5netcdf: 0.7.4 h5py: 2.9.0 Nio: None zarr: 2.3.2 cftime: 1.0.3.4 nc_time_axis: 1.2.0 PseudoNetCDF: None rasterio: 1.0.5 cfgrib: 0.9.6.2 iris: None bottleneck: 1.2.1 dask: 2.6.0 distributed: 2.6.0 matplotlib: 3.0.3 cartopy: 0.16.0 seaborn: 0.9.0 numbagg: None setuptools: 41.0.1 pip: 19.3.1 conda: None pytest: 4.4.1 IPython: 7.1.1 sphinx: 2.0.1 
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