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Data Center Companies Weak

No cloud computing problems here: Digital Realty Trust affirms full year and quarterly guidance.

It's been widely noted that companies that engage in cloud computing/online hosting are down today as Equinix cuts its revenue target—so Rackspace Hosting , Savvis and others are down double digits.

But also getting hurt are companies that lease or operate data centers—companies like DuPontFabros Technology and Digital Realty Trust , a real estate investment trust (REIT).

Both are down about 5 percent. DLR just came out an affirmed its full year and quarterly guidance, but the stock is not responding.

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