Table:
text: Southern Sixers
List of Southern Sixers
The Southern Sixers
Rank_ Peak_Name Elevation_ft Range_ Isolation_
14 Mount Chapman 6417 Great Smoky Mtns 1.48
15 Richland Balsam 6410 Great Balsam Mountains 27.13
16 Potato Knob 6400 Black Mtns .45
17 Old Black 6370 Great Smoky Mtns .70
18 Blackstock Knob 6359 Black Mtns 1.64
19 Celo Knob 6327 Black Mtns 3.52
20 Mount Hallback 6320 Black Mtns 1.11
21 Waterrock Knob 6292 Plott Balsams 10.66
22 Roan High Knob 6285 Unaka Mountains 18.81
23 Roan High Bluff 6267 Unaka Mountains 1.54
24 Browning Knob 6240 Plott Balsams .33
25 Luftee Knob 6234 Great Smoky Mtns 2.53
26 Gibbs Mountain 6224 Black Mtns .81
27 Mount Lyn Lowry 6220 Plott Balsams 1.22

text: Southern Sixers
List of Southern Sixers
The Southern Sixers
Rank_ Peak_Name Elevation_ft Range_ Isolation_
28 Mount Kephart 6217 Great Smoky Mtns 3.09
29 Black Balsam Knob 6214 Great Balsam Mtns 7.08
30 Winter Star Mountain 6212 Black Mtns 1.13
31 Percys Peak 6200 Black Mtns .32
32 Grassy Ridge Bald 6189 Unaka Mountains 2.35
33 Mount Collins 6188 Great Smoky Mtns 1.80
34 Marks Knob 6169 Great Smoky Mtns 1.34
35 Big Cataloochee Mountain 6155 Great Smoky Mtns 2.61
36 Mount Hardison 6134 Great Smoky Mtns .60
37 Tricorner Knob 6120 Great Smoky Mtns .55
38 Mount Yonaguska 6120 Great Smoky Mtns .33
39 Mount Ambler 6120 Great Smoky Mtns .45
40 Mount Hardy 6110 Great Balsam Mtns 3.46

Question: Among the Southern Sixers, what is the height of the Unaka mountains at Roan High Bluff Peak and isolation greater than 1.54?