Brookfield-backed data center provider Csquare’s shares opened marginally lower before closing 1.57% lower in their New York Stock Exchange debut on Thursday, after the initial public offering was priced below its marketed range. Shares opened at $20.9 after the Dallas-based company priced its IPO at $21 per share, below its marketed range of $23 to $27. It closed at $20.67, valuing the firm at $3.2 billion. The debut underscores investors’ caution toward new listings, even for…