--- a/safe.py	Sat May 29 21:32:41 2021 +0100
+++ b/safe.py	Mon May 31 15:01:38 2021 +0100
@@ -119,7 +119,22 @@
         done[k[0]]=1
         aa,ll=hits[k]
         laa=sorted(list(aa))
-        print("(%s %s %s)@%0.1f: %s %s"%(k[0][0],laa[0][0],k[0][1],k[1],laa,sorted(list(ll))))
+        lll=sorted(list(ll))
+        lowAir=laa[0][0]
+        highLava=-1
+        j=-1
+        for i,(_,h) in enumerate(lll):
+          if h>highLava and h<lowAir:
+            highLava=h
+            if h+1==lowAir:
+              j=i
+              break
+        if j>-1:
+          lava='['+','.join(str(e) if i!=j else \
+                            "(%s,%s)"%(e[0],RedFmt%e[1]) for i,e in enumerate(lll))+']'
+          lowAir=RedFmt%lowAir
+        print("%s(%s %s %s)@%0.1f: %s %s"%(' ' if j>-1 else '',
+                                           k[0][0],lowAir,k[0][1],k[1],laa,lava))
   else:
     print(' No nearby landing zones')
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util.py	Mon May 31 15:01:38 2021 +0100
@@ -0,0 +1,28 @@
+'''Utility fns for dealing with block .tsv files'''
+import math,re
+
+IPAT=re.compile('-?[0-9][0-9]*$')
+PPAT=re.compile('[ ,;\[\]]')
+
+Red=''
+eRed=''
+RedFmt=Red+'%s'+eRed
+
+def intsMaybe(ii):
+  return (int(i) for i in ii if IPAT.match(i))
+
+def readHeaders(host,infile,skipColHdrs=True):
+    l=infile.readline().rstrip()
+    ff=PPAT.split(l)
+    (host.nr,host.ox,host.oy,host.oz)=intsMaybe(ff)
+    host.et=ff[9]
+    l=infile.readline().rstrip()
+    (host.orad,host.ymin,host.ymax)=intsMaybe(PPAT.split(l))
+    if skipColHdrs:
+      _=infile.readline()
+
+def d(p1,p2):
+  dx=p1[0]-p2[0]
+  dz=p1[1]-p2[1]
+  dy=p1[2]-p2[2]
+  return math.sqrt((dx*dx)+(dy*dy)+(dz*dz))