Opportunity looks back, sol 1,664
![Opportunity looks back, sol 1,664](https://planetary.s3.amazonaws.com/web/assets/pictures/_768x768_crop_center-center_60_line/20140101_1N275912982EFF90nnP1818R0M2_JPG.jpg 768w, https://planetary.s3.amazonaws.com/web/assets/pictures/_576x576_crop_center-center_60_line/20140101_1N275912982EFF90nnP1818R0M2_JPG.jpg 576w)
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