Problem, I can't find any Adobe or ProPhoto RGB #s for the colors of interest.
Pantone's Cerulean Blue seems appropriate but the RGB #s don't specify a color space (assuming sRGB):http://www.pantone.com/pages/Pantone/panto...?pg=20194&ca=10
Yes, it's sRGB 155, 196, 226 = HTML code # 9BC4E2.
You can check this in Photoshop (see color picker dialog box).
Interestingly, the Lab colors suggested by Mark are somewhat similar and also seem to be within the reach of sRGB.
Just convert to Adobe RGB or ProPhoto if you're looking for respective RGB numbers for reference.
sRGB 155, 196, 226
Adobe RGB 167, 195, 224
ProPhoto RGB 166, 180, 214
Lab 77, -9, -20