diff --git a/lib/xmet/raob.py b/lib/xmet/raob.py
index 119f820..c358f03 100644
--- a/lib/xmet/raob.py
+++ b/lib/xmet/raob.py
@@ -302,8 +302,8 @@ class RAOBObs():
         }
 
     PRESSURE_CODES = {
-        '11': True, '22': True, '33': True, '44': True, '55': True,
-        '66': True, '77': True, '88': True, '99': True
+                    '11': True, '22': True, '33': True, '44': True,
+        '55': True, '66': True, '77': True, '88': True, '99': True
     }
 
     def parse_pressure(self, token: str):
@@ -360,12 +360,6 @@ class RAOBObs():
         }
 
     def parse_ttaa(self) -> dict:
-        #
-        # Return None if there is no height data up to 100mb.
-        #
-        if self.tokens[0][4] != '1':
-            return None
-
         #
         # Return None if there is no station identifier.
         #
@@ -376,6 +370,9 @@ class RAOBObs():
         station   = self.tokens[1]
         samples   = list()
 
+        sample = self.parse_ttaa_sample(self.tokens[2:5])
+        samples.append(sample)
+
         i = 2
 
         while i < len(self.tokens):
@@ -390,7 +387,7 @@ class RAOBObs():
             if prefix == '88':
                 break
 
-            if prefix in self.PRESSURE_CODES:
+            if prefix in self.TTAA_PRESSURES:
                 sample = self.parse_ttaa_sample(self.tokens[i:i+3])
 
                 if sample is not None: