### index of file options from _layouts.thc

  #copy global_symbols
  #copy global_color
  #copy global_medium_cave
  #copy global_small_cave



#############################################################################################################################

layout global_symbols

  symbol-set BCRA
  symbol-hide group cave-centreline
  symbol-assign line gradient BCRA
  #symbol-assign line slope SKBB
  symbol-assign area sand AUT
  symbol-hide line border

endlayout



#############################################################################################################################

layout global_color

  #Foreground color - turn on altitude to see various heights

  #colour map-fg [80 80 80] #GREY
colour map-fg [97 93 43] # YELLOW

  #color map-fg altitude
  #colour map-bg [70 90 70]

symbol-colour line rope  [100 0 0] #make rope red
symbol-colour point rope  [100 0 0] #make rope red

endlayout



#############################################################################################################################

layout global_medium_cave

  scale 1 700
  base-scale 1 300
  scale-bar 200 m  

  #Foreground color - turn on altitude to see various heights

  colour map-fg [80 80 80]
  #color map-fg altitude
  #colour map-bg [70 90 70]  

  language en
  statistics topo-length off
  statistics topo all
  statistics explo-length off
symbol-colour point water-flow [0 0 100]

       

  debug off
  transparency on
  opacity 80
  map-header 0 100 nw
  #overlap 10 cm

  legend on
  legend-columns 2
  legend-width 45 cm
  colour-legend on

  grid bottom
  grid-coords border
  #sketches on
endlayout



#############################################################################################################################

layout global_small_cave

  #scale 1 700
  #base-scale 1 300
  scale-bar 20 m  

  #Foreground color - turn on altitude to see various heights

  colour map-fg [80 80 80]
  #color map-fg altitude
  #colour map-bg [70 90 70]

  

  language en
  statistics topo-length off
  statistics topo all
  statistics explo-length off
symbol-colour point water-flow [0 0 100]       

  debug off
  transparency on
  opacity 80
  map-header 0 100 nw
  #overlap 10 cm 

  legend on
  legend-columns 2
  legend-width 45 cm
  colour-legend on
  grid bottom
  grid-coords border
  #sketches on

endlayout

#############
layout other_formats

#faults It works exactly as line section symbol but you should use -clip off option:

code metapost   
 def l_u_fault (expr P) =
      T:=identity;
      path Q; Q = punked P;
      pickup PenA;
      for t = 0 upto length P - 1:
        pair zz[];
        zz1 := point t of P;
        zz2 := point t+1 of P;
        zz3 := postcontrol t of P;
        zz4 := precontrol t+1 of P;
        if (length(zz3-1/3[zz1,zz2]) > 0.1pt) or
           (length(zz4-2/3[zz1,zz2]) > 0.1pt):
          zz5 = whatever[zz1,zz2];
          (zz3-zz5) = whatever * (zz1-zz2) rotated 90;
          draw zz1--zz5 dashed evenly;
          zz6 = whatever[zz1,zz2];
          (zz4-zz6) = whatever * (zz1-zz2) rotated 90;
          draw zz2--zz6 dashed evenly;
        else:
          draw zz1--zz2 dashed evenly;
        fi;
      endfor;
    enddef;
endcode
endlayout