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Fig. 1 |

Fig. 1

From: Polar Spiral Troughs, Mars

Fig. 1

The residual polar ice caps, showing the troughs and the large chasmata in spiral arrangement (a) North polar ice cap, PIA13163. (b) Portion of the south polar ice cap, PIA02393. Bright regions are the residual ice caps. MOC mosaics (NASA/JPL/MSSS)

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