def METHOD_NAME(self, path):
    """Load keys from header, skipping comments."""
    while True:
        self.line = self.f.readline()
        if self.line == '':  # EOF
            return None
        if self.line.startswith('##'):
            keys = self.line[1:].strip().split('\t')
            self.line = self.f.readline()
            return keys[7:-1]
        if self.line.startswith('#'):
            continue  # comment
        break