ABC closed the gap some as “The Bachelor” picked up steam, but CBS prevailed on Monday in key demos behind anchors “2 Broke Girls” and “How I Met Your Mother.” As for new shows, Fox’s “The Following” dropped off in its fourth outing, while NBC’s “Deception” rose in its sixth airing.

According to preliminary national estimates from Nielsen, CBS swept the night’s half-hours in 18-49 (including a couple of ties with ABC), 25-54 and total viewers — even though it lost some of the audience it had when it aired last week on the night following the net’s coverage of the Super Bowl.

“How I Met Your Mother” (3.2/9 in 18-49, 9.0 million viewers overall) was down the most, about 20%, but was the night’s No. 2 show in 18-49 and No. 1 in 18-34 (2.8/9). It was followed by “Rules of Engagement” (2.8/7 in 18-49, 8.4 million viewers overall), “2 Broke Girls” (3.5/9 in 18-49, 10.8 million viewers overall) and “Mike & Molly” (2.9/7 in 18-49, 10.4 million viewers overall), all of which were down by about 10% from last week. Similarly, “Hawaii Five-0” (2.1/6 in 18-49, 9.5 million viewers overall) lost nearly 10% but remained the top broadcast program in the timeslot.

At ABC, “The Bachelor” (2.7/7 in 18-49, 8.4 million viewers overall) hit a season high, rising 13% from last week and matching the strong delivery of its special Tuesday night episode last week. The dating show topped its reality competition on NBC, “The Biggest Loser” (2.0/5 in 18-49, 5.5 million viewers overall), by its biggest margin yet in adults 18-49 (35%). Also up was 10 p.m. drama “Castle” (2.0/5 in 18-49, 8.9 million viewers overall).

Both “Bachelor” and “Castle” edged out their CBS competition to win their timeslots in adults 18-34.

Fox’s “Bones” (2.2/6 in 18-49, 8.7 million viewers overall) dipped 8% week to week, and newcomer “The Following” (2.4/6 in 18-49, 7.7 million viewers overall) declined by 17% from last week. Next week could be a key one for “The Following” as it looks to stop the bleeding and return to its previously potent level.

NBC’s “The Biggest Loser” was down just slightly week to week, but 10 p.m. drama “Deception” (1.3/3 in 18-49, 3.3 million viewers overall) bounced back from its low of last week (1.1/3 in 18-49, 3.1 million viewers overall).

At CW, “The Carrie Diaries” (0.6/2 in 18-49, 1.3 million viewers overall) dipped a smidge week to week but continues to look a bit stronger in 18-34 (0.7/2) than it did with its first few episodes in January. Not so hot is vet “90210” (0.3/1 in 18-49, 0.7 million viewers overall), which has really struggled in its new, later timeslot.

Preliminary 18-49 averages for the night: CBS, 2.8/7; ABC, 2.5/7; Fox, 2.3/6; NBC, 1.8/5; Univision, 1.6/4; CW, 0.5/1.

In total viewers: CBS, 9.6 million; ABC, 8.6 million; Fox, 8.2 million; NBC, 4.8 million; Univision, 3.8 million; CW, 1.0 million.