survey stretches 
     centreline 
		
     1.3   1.3a     2.620  156.73  -10.97      
     1.3   1.3b     0.270   57.99   -1.12      
     1.3   1.3c     0.310  228.86    1.57      
     1.3   1.3d     2.940  331.52    0.94      
     1.3   1.3e     2.420  318.32    5.03      
     1.3   1.3f     1.860  288.62   10.30      
     1.3   1.3g     1.210  276.54   14.18      
     1.3   1.3h     5.980  334.42   -4.96      
     1.3   1.3i     6.140  320.39    0.28      
     1.3   1.3j     3.640  302.65    0.05      
     1.3   1.3k     2.930  291.71    1.72      
     1.3   1.3l     5.830  342.56   -4.62      
     1.4   1.4a     2.350  261.35   24.64      
     1.4   1.4b     2.560  282.84   21.52      
     1.4   1.4c     3.240  302.48   18.11      
     1.4   1.4d     1.920   19.69    0.88      
     1.4   1.4e     1.860   38.41    3.51      
     1.4   1.4f     5.060   43.47    1.68      
     1.4   1.4g     4.450   49.36    1.97      
     1.4   1.4h     4.290   53.86    3.41      
     1.4   1.4i     1.810   69.26    5.13      
     1.4   1.4j     1.380   82.06    4.62      
     1.4   1.4k     1.260  111.55    9.15      
     1.4   1.4l     1.820  137.62    8.10      
     1.5   1.5a     0.750  123.03   -1.74      
     1.5   1.5b     3.250   43.19    0.65      
     1.5   1.5c     2.480   62.67   -1.07      
     1.5   1.5d     3.280   87.52    2.92      
     1.6   1.6a     3.450  126.89    6.66      
     1.6   1.6b     3.720  135.13    5.60      
     1.6   1.6c     3.440  142.75    9.98      
     1.6   1.6d     2.160  159.45    6.20      
     1.6   1.6e     1.120  192.07    6.75      
     1.6   1.6f     0.990  230.15    5.15      
     1.6   1.6g     1.030  250.82    3.02      
     1.6   1.6h     0.990  177.89   79.84      
     1.6   1.6i     0.470  161.66  -84.70      
     1.6   1.6j     2.000  267.17    1.49      
     1.6   1.6k     2.070  260.47    2.07      
     1.6   1.6l     4.290  256.00   -2.11      
     1.6   1.6m     2.020  279.98    2.03      
     1.6   1.6n     2.880  283.23    2.86      
     1.6   1.6o     3.260  294.77    3.03      
     1.6   1.6p     3.300  314.19   11.65      
     1.6   1.6q     2.360  340.99    7.12      
     1.6   1.6r     2.360  353.46    3.35      
     1.6   1.6s     3.410  307.23   58.75      
     1.6   1.6t     3.070  313.63   26.94      
     1.7   1.7a     2.550   37.52  -13.76      
     1.7   1.7b     2.540   36.18  -13.84      
     1.7   1.7c     2.520   35.92  -12.85      
     1.7   1.7d     2.220  157.08   -8.20      
     1.7   1.7e     1.390  137.88   -6.02      
     1.7   1.7f     1.050  111.52   -5.76      
     1.7   1.7g     0.530  115.87   75.27      
     1.7   1.7h     0.230   17.80  -79.97      
     1.7   1.7i     0.970  292.13    8.05      
     1.7   1.7j     0.970  318.48    9.76      
     1.7   1.7k     0.590  349.45   13.78      
     1.7   1.7l     2.270  311.81   20.77
	  endcentreline
	endsurvey
	equate 1.3@entrance 1.3@lower_passage
	equate 1.0@entrance 1.0@stretches
	equate 1.2@entrance 1.2@stretches
	equate 1.3@entrance 1.3@stretches
	equate 1.4@lower_passage 1.4@stretches
	equate 1.5@lower_passage 1.5@stretches
	equate 1.6@lower_passage 1.6@stretches
	equate 1.7@lower_passage 1.7@stretches
  survey lower_passage
   centreline
		data normal from to tape compass clino
     1.3         1.4       3.820  328.42  -10.88      
     1.4         1.5       2.010   62.24    2.28      
     1.5         1.6       2.120   70.99  -12.06      
     1.6         1.7       1.500  312.36   11.75
    endcentreline
   endsurvey
	equate 1.3@entrance 1.3@lower_passage
endsurvey