|NGC /IC||R'(HST)||R'(ground based)||R'||Y(R')|
|104||0.69 0.07||0.68 0.09||0.69 0.07||0.253 0.012|
|288||0.69 0.14||0.69 0.14||0.250 0.024|
|362||0.75 0.08||0.63 0.15||0.75 0.08||0.260 0.012|
|1257||0.49 0.14||0.49 0.14||0.213 0.024|
|1261||0.62 0.10||0.69 0.09||0.62 0.10||0.238 0.017|
Notes. The final adopted value R' is the weighted average between the two estimates, when available. Y(R') is the corresponding He abundance. The complete table is available at the CDS.
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