UPDATE: In the updated estimates released late Wednesday by Nielsen, there was no change for “Marvel’s Agents of SHIELD,” which did a 2.2/6 in 18-49 and 6.67 million viewers overall. Gaining a tenth in the nationals were: “NCIS” (3.0/8 in 18-49, 19.36m), “The Mindy Project” (1.4/4 in 18-49, 2.66m) and “Supernatural” (1.1/3 in 18-49, 2.36m). The only program to edge down was “The Biggest Loser” (1.8/5 in 18-49, 6.26m). As a result of the updates, CBS did indeed tie NBC for the night’s 18-49 lead (2.5/7).

FX’s steady “Sons of Anarchy” was the top cable program in 18-49 (2.3/6), drawing 4.38 million total viewers. ESPN scored with its college basketball doubleheader of Michigan State-Kentucky (1.4/4 in 18-49, 4.00m) and Duke-Kansas (1.3/4 in 18-49, 2.98m).

ABC’s “Marvel’s Agents of SHIELD” continues to lose viewers, on Tuesday declining in the young-adults demo for a sixth straight telecast following its huge premiere. It was also a rough night for Fox’s comedies and a good one for CW’s dramas.

NBC edged out CBS in adults 18-49 (though the Eye could catch it in the nationals) and has now won all three Tuesdays of the season when it has aired its regular schedule. CBS won in 25-54 and total viewers.

According to preliminary national estimates from Nielsen, CBS’ “NCIS” dominated at 8 p.m. (2.9 rating/8 share in adults 18-49, 19.2 million viewers overall), steady week to week and opening up its biggest advantage yet over ABC’s competing drama, “Agents of SHIELD” (2.2/6 in 18-49, 6.6 million viewers overall).

After opening in September to a big 4.7 rating in adults 18-49, “SHIELD” has declined with its next six original episodes: 3.3, 2.9, 2.8, 2.7, 2.5 last week and now a 2.2. And last night, it wasn’t far ahead of NBC’s third-place “The Biggest Loser” (1.9/5 in 18-49, 6.3 million viewers overall).

ABC can still point to time-period improvement for “Agents of SHIELD,” but it was clearly hoping the high-profile project would hold on to a much bigger chunk of its opening-night audience than it is now.

NBC followed “Biggest Loser” with a live eliminations episode of “The Voice” (3.4/9 in 18-49, 11.4 million viewers overall), which matched last week’s score for a two-hour installment and was Tuesday’s No. 1 show in 18-49 , and “Chicago Fire” (2.2/6 in 18-49, 7.8 million viewers overall), which returned after a two-week break with slight gains over its most recent episode. In the comparable week a year ago, airing behind “Law & Order: SVU” on Wednesday night, “Chicago Fire” did a 1.6 demo rating.

At CBS, “NCIS” was followed by “NCIS: Los Angeles” (2.4/6 in 18-49, 14.7 million viewers overall), which was flat week to week, and “Person of Interest” (2.0/6 in 18-49, 12.5 million viewers overall), which edged up. All three CBS drama easily led their hours in total viewers.

In the night’s tightening comedy battle, Fox’s “New Girl” (1.7/5 in 18-49, 3.3 million viewers overall) and “The Mindy Project” (1.3/4 in 18-49, 2.6 million viewers overall) were down while ABC’s “The Goldbergs” (1.7/5 in 18-49, 5.2 million viewers overall) and “Trophy Wife” (1.2/3 in 18-49, 3.8 million viewers overall) were back on an upswing after a down showing last week — and despite the fact that “Agents of SHIELD” provided a softer lead-in. A week ago, “New Girl” held a 0.5 ratings point advantage over “Goldbergs,” and “Mindy” beat “Trophy” by four-tenths.

Also down week to week for Fox were its opening-hour comedies “Dads” (1.2/4 in 18-49, 3.2 million viewers overall) and “Brooklyn Nine-Nine” (1.4/4 in 18-49, 3.3 million viewers overall), which placed fourth among the Big Four in 18-49. All four of the net’s half-hours matched or set lows in 18-49.

At CW, “The Originals” followed the news of its full-season pickup by drawing its largest same-night audience of the season (2.4 million) while matching or setting highs in key demos, including women 18-34 (1.5/4). Also up week to week was vet “Supernatural” (1.0/3 in 18-49, 2.3 million viewers overall). Combined, the dramas gave the net its most-watched Tuesday in more than four years.

Preliminary 18-49 averages for the night: NBC, 2.5/7; CBS, 2.4/7; ABC, 1.5/4; Fox, 1.4/4; Univision, 1.3/4; CW, 1.1/3; Telemundo, 0.6/2.

In total viewers: CBS, 15.5 million; NBC, 8.5 million; ABC, 4.6 million; Univision, 3.6 million; Fox, 3.1 million; CW, 2.4 million; Telemundo, 1.4 million.