[Matplotlib-users] A imshow map without fill color

[GoogleWind]

Dear all, I would like to create imshow map using ax.imshow(arr). However, I
got the image as Fig. 1. Is there any setting to get the image as Fig. 2
(i.e., without fill color for the cell).

<Loading Image...>
Fig. 1

<Loading Image...>
Fig. 2


Thanks in advance for your answer.
Jiacong Huang



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