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/usr/share/dvb/atsc/us-Cable-IRC-center-frequencies-QAM256 is in dvb-apps 1.1.1+rev1483-1.

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The actual contents of the file can be viewed below.

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# US Cable center frequencies
# Incrementally Related Carriers (IRC)
# Channels are in ascending EIA/NCTA channel designation order

#1
A  75000000 QAM256
A  57000000 QAM256
A  63000000 QAM256
A  69000000 QAM256
A  79000000 QAM256
A  85000000 QAM256
A 177000000 QAM256
A 183000000 QAM256
A 189000000 QAM256
#10
A 195000000 QAM256
A 201000000 QAM256
A 207000000 QAM256
A 213000000 QAM256
A 123000000 QAM256
A 129000000 QAM256
A 135000000 QAM256
A 141000000 QAM256
A 147000000 QAM256
A 153000000 QAM256
#20
A 159000000 QAM256
A 165000000 QAM256
A 171000000 QAM256
A 219000000 QAM256
A 225000000 QAM256
A 231000000 QAM256
A 237000000 QAM256
A 243000000 QAM256
A 249000000 QAM256
A 255000000 QAM256
#30
A 261000000 QAM256
A 267000000 QAM256
A 273000000 QAM256
A 279000000 QAM256
A 285000000 QAM256
A 291000000 QAM256
A 297000000 QAM256
A 303000000 QAM256
A 309000000 QAM256
A 315000000 QAM256
#40
A 321000000 QAM256
A 327000000 QAM256
A 333000000 QAM256
A 339000000 QAM256
A 345000000 QAM256
A 351000000 QAM256
A 357000000 QAM256
A 363000000 QAM256
A 369000000 QAM256
A 375000000 QAM256
#50
A 381000000 QAM256
A 387000000 QAM256
A 393000000 QAM256
A 399000000 QAM256
A 405000000 QAM256
A 411000000 QAM256
A 417000000 QAM256
A 423000000 QAM256
A 429000000 QAM256
A 435000000 QAM256
#60
A 441000000 QAM256
A 447000000 QAM256
A 453000000 QAM256
A 459000000 QAM256
A 465000000 QAM256
A 471000000 QAM256
A 477000000 QAM256
A 483000000 QAM256
A 489000000 QAM256
A 495000000 QAM256
#70
A 501000000 QAM256
A 507000000 QAM256
A 513000000 QAM256
A 519000000 QAM256
A 525000000 QAM256
A 531000000 QAM256
A 537000000 QAM256
A 543000000 QAM256
A 549000000 QAM256
A 555000000 QAM256
#80
A 561000000 QAM256
A 567000000 QAM256
A 573000000 QAM256
A 579000000 QAM256
A 585000000 QAM256
A 591000000 QAM256
A 597000000 QAM256
A 603000000 QAM256
A 609000000 QAM256
A 615000000 QAM256
#90
A 621000000 QAM256
A 627000000 QAM256
A 633000000 QAM256
A 639000000 QAM256
A 645000000 QAM256
A  93000000 QAM256
A  99000000 QAM256
A 105000000 QAM256
A 111000000 QAM256
A 117000000 QAM256
#100
A 651000000 QAM256
A 657000000 QAM256
A 663000000 QAM256
A 669000000 QAM256
A 675000000 QAM256
A 681000000 QAM256
A 687000000 QAM256
A 693000000 QAM256
A 699000000 QAM256
A 705000000 QAM256
#110
A 711000000 QAM256
A 717000000 QAM256
A 723000000 QAM256
A 729000000 QAM256
A 735000000 QAM256
A 741000000 QAM256
A 747000000 QAM256
A 753000000 QAM256
A 759000000 QAM256
A 765000000 QAM256
#120
A 771000000 QAM256
A 777000000 QAM256
A 783000000 QAM256
A 789000000 QAM256
A 795000000 QAM256
A 801000000 QAM256