Across 1. Catenary fcn. 5. O-7 asea 9. To stand (L.) 14. Surjective 15. Nordhoff, California, nowadays 16. Low point 17. Make like a McCormick 18. What you're having if your knickers are in a twist 19. Place to stay 20. Underflow message, often 23. Lyric poem 24. That (Sp.) 25. Without chemical reaction 29. Like the "n" in mon 31. Operator 33. Something to use on a tough row 34. Empire ___ 36. May stressor, or most suitable 39. Format that uses 57 Across 42. Yiddish word in "The Serenity Now" 43. Like some hot cereal 44. Have 45. Bumps 47. All books have them 51. Hired 54. Infamous Amin 56. It may be pale 57. Mantissas 60. Barbed evening 63. Army "outfit" 64. Early word 65. More adept 66. Scores high on 67. Muslim leader 68. Softly in a score 69. ___ Di 70. Copenhagener

Down 1. Velvet rope 2. New York tribe 3. A piano system has two (rarely, three) 4. Arizona tribe 5. Crwths 6. Eritrean neighbor 7. Labyrinthine 8. Tin ___ 9. Entrap 10. Small drum 11. Bustle 12. Free (of) 13. Before 21. They appear in many slope discussions 22. Transported well? 26. Word before the necessary part, not the sufficient part 27. Bizarre series, 2004-10 28. Nevertheless 30. Dilbert intern 32. Spanish honorific 35. How some work out 37. Having flowing language 38. Nickname for an obese man 39. It shares an exit with the CIA 40. URL 41. Made into synfuel 42. One who overconsumes 56 Across 46. Frequency that seems rapid when one is middle-aged 48. Type of hat 49. Padfoot portrayer 50. CTW street 52. Ruhr city 53. TNT part 55. Clueless 58. South American empire 59. Between 60. Blame 61. Eastern sash 62. Chicken-King connector