#Ddepth obs for NGRIP from AICC2012.
2099.9	16.29	2
2123.6	15.8	2
2157.1	15.56	2
2218.2	15.7	2
2255.6	12.85	2
2345.2	11.74	2
2364.5	12.36	2
2419.31	11.6	2
2465.1	8.85	2
2506.9	8.16	1.5
2577.8	7.66	1.5
2685.1	7.15	2
2890.2	5.54	2
2895.8	4.44	1.5
2936.5	7.8	1.5
