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Table 1
Mid-eclipse times of NN Ser measured with MONET/N.
| Cycle | JD | Error | BJD(TDB) | O − Cell |
| 2 450 000+ | (days) | 2 450 000+ | (s) | |
|
|
||||
| (a) January /February 2010 (Paper I). | ||||
| 60489 | 5212.9431997 | 0.0000069 | 5212.9418190 | 0.20 |
| 60505 | 5215.0243170 | 0.0000067 | 5215.0230965 | −0.17 |
| 60528 | 5218.0159241 | 0.0000044 | 5218.0149383 | −0.23 |
| 60735 | 5244.9402624 | 0.0000029 | 5244.9415257 | 0.09 |
| 60743 | 5245.9808144 | 0.0000032 | 5245.9821657 | 0.02 |
| 60751 | 5247.0213676 | 0.0000034 | 5247.0228067 | 0.02 |
| 60774 | 5250.0129571 | 0.0000034 | 5250.0146473 | −0.16 |
| (b) September 2010 to February 2013 (this work). | ||||
| 62316 | 5450.5995341 | 0.0000052 | 5450.5981913 | −0.35 |
| 62339 | 5453.5916006 | 0.0000067 | 5453.5900372 | −0.10 |
| 62347 | 5454.6323120 | 0.0000067 | 5454.6306732 | −0.53 |
| 62462 | 5469.5925302 | 0.0000049 | 5469.5899042 | 0.87 |
| 62531 | 5478.5685430 | 0.0000051 | 5478.5654275 | 0.39 |
| 63403 | 5591.9955682 | 0.0000030 | 5591.9953015 | 0.20 |
| 63449 | 5597.9787495 | 0.0000031 | 5597.9789848 | −0.06 |
| 63457 | 5599.0193095 | 0.0000027 | 5599.0196329 | 0.55 |
| 63472 | 5600.9703359 | 0.0000067 | 5600.9708248 | −0.33 |
| 63671 | 5626.8541370 | 0.0000041 | 5626.8567788 | 0.21 |
| 63672 | 5626.9842067 | 0.0000037 | 5626.9868588 | 0.20 |
| 63679 | 5627.8946901 | 0.0000041 | 5627.8974134 | −0.35 |
| 63740 | 5635.8289827 | 0.0000044 | 5635.8323043 | −0.15 |
| 63741 | 5635.9590539 | 0.0000049 | 5635.9623850 | −0.10 |
| 63756 | 5637.9101120 | 0.0000042 | 5637.9135830 | −0.45 |
| 63833 | 5647.9256179 | 0.0000033 | 5647.9297557 | −0.30 |
| 63864 | 5651.9578679 | 0.0000046 | 5651.9622470 | 0.30 |
| 63879 | 5653.9089538 | 0.0000031 | 5653.9134435 | −0.19 |
| 63886 | 5654.8194618 | 0.0000037 | 5654.8240016 | −0.44 |
| 63925 | 5659.8923285 | 0.0000038 | 5659.8971306 | −0.14 |
| 63933 | 5660.9329164 | 0.0000053 | 5660.9377686 | −0.42 |
| 64079 | 5679.9239504 | 0.0000038 | 5679.9294753 | 0.08 |
| 64086 | 5680.8344900 | 0.0000039 | 5680.8400351 | −0.02 |
| 64116 | 5684.7368230 | 0.0000052 | 5684.7424416 | 0.17 |
| 64132 | 5686.8180703 | 0.0000035 | 5686.8237195 | −0.22 |
| 64784 | 5771.6337400 | 0.0000040 | 5771.6359752 | −0.30 |
| 64869 | 5782.6914476 | 0.0000067 | 5782.6927870 | −0.40 |
| 64938 | 5791.6677191 | 0.0000043 | 5791.6683161 | −0.52 |
| 64961 | 5794.6598199 | 0.0000041 | 5794.6601694 | 0.33 |
| 64976 | 5796.6111770 | 0.0000036 | 5796.6113657 | −0.19 |
| 64992 | 5798.6926278 | 0.0000045 | 5798.6926456 | −0.42 |
| 65053 | 5806.6281610 | 0.0000047 | 5806.6275377 | −0.18 |
| 65081 | 5810.2706975 | 0.0000040 | 5810.2697878 | 0.32 |
| 65084 | 5810.6609723 | 0.0000097 | 5810.6600323 | 0.67 |
| 65099 | 5812.6123145 | 0.0000027 | 5812.6112242 | −0.23 |
| 65099 | 5812.6123171 | 0.0000048 | 5812.6112268 | −0.01 |
| 65360 | 5846.5653892 | 0.0000036 | 5846.5621492 | 0.13 |
| 65460 | 5859.5738976 | 0.0000089 | 5859.5701607 | −0.24 |
| 65963 | 5925.0031268 | 0.0000080 | 5925.0004922 | 0.66 |
| 65994 | 5929.0353491 | 0.0000050 | 5929.0329653 | −0.38 |
| 66209 | 5957.0004918 | 0.0000035 | 5957.0002090 | 0.32 |
| 66324 | 5971.9584470 | 0.0000038 | 5971.9594273 | 0.25 |
| 66332 | 5972.9990053 | 0.0000056 | 5973.0000740 | 0.71 |
| 66362 | 5976.9010792 | 0.0000080 | 5976.9024783 | 0.65 |
| 66370 | 5977.9416245 | 0.0000044 | 5977.9431113 | −0.07 |
| 66409 | 5983.0143233 | 0.0000047 | 5983.0162339 | −0.42 |
| 66416 | 5983.9248143 | 0.0000036 | 5983.9268000 | 0.01 |
| 66615 | 6009.8088279 | 0.0000045 | 6009.8127551 | 0.12 |
| 66631 | 6011.8899714 | 0.0000029 | 6011.8940322 | −0.36 |
| 66669 | 6016.8327239 | 0.0000032 | 6016.8370844 | 0.14 |
| 66670 | 6016.9627977 | 0.0000028 | 6016.9671658 | 0.24 |
| 66677 | 6017.8733096 | 0.0000033 | 6017.8777301 | 0.50 |
| 66685 | 6018.9138903 | 0.0000027 | 6018.9183694 | 0.33 |
| 66815 | 6035.8235355 | 0.0000061 | 6035.8287909 | 0.25 |
| 66893 | 6045.9694909 | 0.0000055 | 6045.9750363 | −0.44 |
| 66900 | 6046.8800348 | 0.0000041 | 6046.8855994 | −0.28 |
| 66908 | 6047.9206573 | 0.0000031 | 6047.9262424 | −0.14 |
| 67284 | 6096.8315332 | 0.0000034 | 6096.8363914 | 0.13 |
| 67330 | 6102.8155143 | 0.0000035 | 6102.8200727 | −0.46 |
| 67337 | 6103.7261262 | 0.0000028 | 6103.7306356 | −0.32 |
| 67352 | 6105.6774387 | 0.0000036 | 6105.6818401 | −0.16 |
| 67675 | 6147.6963688 | 0.0000058 | 6147.6977420 | 0.19 |
| 67698 | 6150.6884525 | 0.0000041 | 6150.6895788 | −0.45 |
| 67775 | 6160.7054661 | 0.0000046 | 6160.7057628 | 0.42 |
| 67928 | 6180.6093127 | 0.0000034 | 6180.6080271 | 0.11 |
| 67936 | 6181.6500361 | 0.0000036 | 6181.6486726 | 0.46 |
| 68028 | 6193.6182396 | 0.0000047 | 6193.6160366 | −0.65 |
| 69168 | 6341.9060724 | 0.0000028 | 6341.9074599 | 0.06 |
| 69575 | 6394.8450806 | 0.0000020 | 6394.8500987 | 0.04 |
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