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new file mode 100644
index 0000000..0c2c5db
--- /dev/null
+++ b/inst/extdata/xs.csv
@@ -0,0 +1,80 @@
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+PT4,5158003.691,297152.03,1982.060367,3.229,LB,XS01,604.132,1982.060367
+PT5,5158003.711,297152.608,1980.400262,3.808,LB,XS01,603.626,1980.400262
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+PT19,5158004.76,297158.791,1973.208661,10.208,xs,XS01,601.434,1973.208661
+PT20,5158004.868,297159.272,1973.290682,10.701,xs,XS01,601.459,1973.290682
+PT21,5158004.965,297159.586,1973.763123,11.029,WSE,XS01,601.603,1973.763123
+PT22,5158005.106,297160.446,1973.969816,11.901,RB,XS01,601.666,1973.969816
+PT23,5158005.415,297161.102,1974.347113,12.626,RB,XS01,601.781,1974.347113
+PT24,5158005.557,297162.691,1974.72769,14.221,RB,XS01,601.897,1974.72769
+PT25,5158005.467,297162.998,1975.285433,14.541,RB,XS01,602.067,1975.285433
+PT26,5158005.688,297164.21,1975.705381,15.773,RB,XS01,602.195,1975.705381
+PT27,5158006.021,297165.456,1975.649606,17.063,RB,XS01,602.178,1975.649606
+PT28,5158006.381,297166.47,1975.177165,18.139,RB,XS01,602.034,1975.177165
+PT29,5158006.685,297168.235,1974.60958,19.93,RB,XS01,601.861,1974.60958
+PT30,5158007.045,297169.777,1974.822835,21.513,RB,XS01,601.926,1974.822835
+PT31,5158006.899,297170.617,1977.03084,22.366,RB,XS01,602.599,1977.03084
+PT32,5158006.914,297171.389,1977.814961,23.138,RB,XS01,602.838,1977.814961
+PT33,5158007.019,297171.76,1979.635827,23.524,RB,XS01,603.393,1979.635827
+PT34,5158007.001,297173.323,1979.940945,25.087,RB,XS01,603.486,1979.940945
+PT35,5158007.704,297176.97,1979.504593,28.801,RB,XS01,603.353,1979.504593
+PT36,5158007.933,297178.746,1980.177165,30.592,RB,XS01,603.558,1980.177165
+PT37,5158007.819,297180.223,1981.781496,32.073,RB,XS01,604.047,1981.781496
+PT38,5158006.947,297183.513,1982.821522,35.477,RB,XS01,604.364,1982.821522
+PT39,5158006.377,297186.189,1983.697507,38.213,RB,XS01,604.631,1983.697507
+PT40,5158006.141,297187.385,1985.288714,39.432,RB,XS01,605.116,1985.288714
+PT41,5158006.496,297188.667,1987.69685,40.762,RB,XS01,605.85,1987.69685
+PT42,5158005.184,297194.221,1988.379265,46.469,RB,XS01,606.058,1988.379265
+PT43,5157983.92,297150.744,1984.274934,0,LB,XS02,604.807,1984.274934
+PT44,5157982.685,297153.429,1984.49147,2.955,LB,XS02,604.873,1984.49147
+PT45,5157981.792,297155.485,1984.563648,5.197,LB,XS02,604.895,1984.563648
+PT46,5157981.736,297155.829,1983.733596,5.545,LB,XS02,604.642,1983.733596
+PT47,5157981.252,297156.603,1982.837927,6.458,LB,XS02,604.369,1982.837927
+PT48,5157980.493,297157.821,1981.410761,7.893,LB,XS02,603.934,1981.410761
+PT49,5157979.496,297159.766,1980.255906,10.079,LB,XS02,603.582,1980.255906
+PT50,5157978.849,297161.623,1979.21916,12.046,LB,XS02,603.266,1979.21916
+PT51,5157977.799,297163.83,1977.857612,14.49,LB,XS02,602.851,1977.857612
+PT52,5157977.038,297165.013,1977.454068,15.896,LB,XS02,602.728,1977.454068
+PT53,5157976.028,297166.765,1977.782152,17.919,LB,XS02,602.828,1977.782152
+PT54,5157975.612,297167.703,1978.316929,18.945,LB,XS02,602.991,1978.316929
+PT55,5157975.197,297168.627,1978.248031,19.958,LB,XS02,602.97,1978.248031
+PT56,5157975.155,297169.237,1977.867454,20.569,LB,XS02,602.854,1977.867454
+PT57,5157975.11,297170.193,1976.906168,21.526,LB,XS02,602.561,1976.906168
+PT58,5157974.847,297171.527,1976.564961,22.886,LB,XS02,602.457,1976.564961
+PT59,5157974.364,297173.02,1976.227034,24.455,LB,XS02,602.354,1976.227034
+PT60,5157973.47,297175.288,1975.948163,26.893,LB,XS02,602.269,1975.948163
+PT61,5157972.93,297176.63,1975.452756,28.339,LB,XS02,602.118,1975.452756
+PT62,5157972.611,297177.946,1974.934383,29.693,LB,XS02,601.96,1974.934383
+PT63,5157972.244,297179.506,1974.307743,31.296,WSE,XS02,601.769,1974.307743
+PT64,5157971.874,297180.604,1973.612205,32.455,xs,XS02,601.557,1973.612205
+PT65,5157971.675,297181.653,1972.854331,33.522,xs,XS02,601.326,1972.854331
+PT66,5157971.463,297182.363,1972.585302,34.263,xs,XS02,601.244,1972.585302
+PT67,5157972.688,297183.365,1972.404856,35.846,xs,XS02,601.189,1972.404856
+PT68,5157972.268,297184.349,1972.037402,36.916,xs,XS02,601.077,1972.037402
+PT69,5157972.098,297184.745,1972.230971,37.347,xs,XS02,601.136,1972.230971
+PT70,5157971.703,297185.677,1972.408136,38.359,xs,XS02,601.19,1972.408136
+PT71,5157971.377,297186.577,1973.405512,39.316,xs,XS02,601.494,1973.405512
+PT72,5157971.08,297186.927,1974.212598,39.775,WSE,XS02,601.74,1974.212598
+PT73,5157970.63,297187.208,1974.832677,40.306,RB,XS02,601.929,1974.832677
+PT74,5157970.282,297187.544,1975.853018,40.79,RB,XS02,602.24,1975.853018
+PT75,5157970.328,297188.577,1978.467848,41.824,RB,XS02,603.037,1978.467848
+PT76,5157969.75,297189.313,1979.49147,42.759,RB,XS02,603.349,1979.49147
+PT77,5157969.402,297189.737,1982.404856,43.308,RB,XS02,604.237,1982.404856
+PT78,5157969.116,297190.159,1988.461286,43.818,RB,XS02,606.083,1988.461286
+PT79,5157967.331,297193.327,1988.421916,47.454,RB,XS02,606.071,1988.421916