# best fit: Y = -106.6 + 0.06 X

# covariance matrix:

# [ 39602, -19.9

#   -19.9, 0.01]

# chisq = 0.8

data: 1970 12 3.16228

data: 1980 11 2.23607

data: 1990 14 1.82574

data: 2000 13 1.58114

fit: 1961 11.06

hi : 1961 14.1276

lo : 1961 7.99243

fit: 1961.3 11.078

hi : 1961.3 14.1172

lo : 1961.3 8.03877

fit: 1961.6 11.096

hi : 1961.6 14.1069

lo : 1961.6 8.08509

fit: 1961.9 11.114

hi : 1961.9 14.0966

lo : 1961.9 8.13137

fit: 1962.2 11.132

hi : 1962.2 14.0864

lo : 1962.2 8.17761

fit: 1962.5 11.15

hi : 1962.5 14.0762

lo : 1962.5 8.22383

fit: 1962.8 11.168

hi : 1962.8 14.066

lo : 1962.8 8.27

fit: 1963.1 11.186

hi : 1963.1 14.0559

lo : 1963.1 8.31614

fit: 1963.4 11.204

hi : 1963.4 14.0458

lo : 1963.4 8.36224

fit: 1963.7 11.222

hi : 1963.7 14.0357

lo : 1963.7 8.4083

fit: 1964 11.24

hi : 1964 14.0257

lo : 1964 8.45432

fit: 1964.3 11.258

hi : 1964.3 14.0157

lo : 1964.3 8.5003

fit: 1964.6 11.276

hi : 1964.6 14.0058

lo : 1964.6 8.54624

fit: 1964.9 11.294

hi : 1964.9 13.9959

lo : 1964.9 8.59213

fit: 1965.2 11.312

hi : 1965.2 13.986

lo : 1965.2 8.63798

fit: 1965.5 11.33

hi : 1965.5 13.9762

lo : 1965.5 8.68378

fit: 1965.8 11.348

hi : 1965.8 13.9665

lo : 1965.8 8.72953

fit: 1966.1 11.366

hi : 1966.1 13.9568

lo : 1966.1 8.77523

fit: 1966.4 11.384

hi : 1966.4 13.9471

lo : 1966.4 8.82088

fit: 1966.7 11.402

hi : 1966.7 13.9375

lo : 1966.7 8.86647

fit: 1967 11.42

hi : 1967 13.928

lo : 1967 8.91201

fit: 1967.3 11.438

hi : 1967.3 13.9185

lo : 1967.3 8.9575

fit: 1967.6 11.456

hi : 1967.6 13.9091

lo : 1967.6 9.00292

fit: 1967.9 11.474

hi : 1967.9 13.8997

lo : 1967.9 9.04828

fit: 1968.2 11.492

hi : 1968.2 13.8904

lo : 1968.2 9.09358

fit: 1968.5 11.51

hi : 1968.5 13.8812

lo : 1968.5 9.13882

fit: 1968.8 11.528

hi : 1968.8 13.872

lo : 1968.8 9.18399

fit: 1969.1 11.546

hi : 1969.1 13.8629

lo : 1969.1 9.22908

fit: 1969.4 11.564

hi : 1969.4 13.8539

lo : 1969.4 9.27411

fit: 1969.7 11.582

hi : 1969.7 13.8449

lo : 1969.7 9.31906

fit: 1970 11.6

hi : 1970 13.8361

lo : 1970 9.36393

fit: 1970.3 11.618

hi : 1970.3 13.8273

lo : 1970.3 9.40872

fit: 1970.6 11.636

hi : 1970.6 13.8186

lo : 1970.6 9.45343

fit: 1970.9 11.654

hi : 1970.9 13.8099

lo : 1970.9 9.49805

fit: 1971.2 11.672

hi : 1971.2 13.8014

lo : 1971.2 9.54259

fit: 1971.5 11.69

hi : 1971.5 13.793

lo : 1971.5 9.58703

fit: 1971.8 11.708

hi : 1971.8 13.7846

lo : 1971.8 9.63137

fit: 1972.1 11.726

hi : 1972.1 13.7764

lo : 1972.1 9.67561

fit: 1972.4 11.744

hi : 1972.4 13.7683

lo : 1972.4 9.71975

fit: 1972.7 11.762

hi : 1972.7 13.7602

lo : 1972.7 9.76378

fit: 1973 11.78

hi : 1973 13.7523

lo : 1973 9.80769

fit: 1973.3 11.798

hi : 1973.3 13.7445

lo : 1973.3 9.85149

fit: 1973.6 11.816

hi : 1973.6 13.7368

lo : 1973.6 9.89517

fit: 1973.9 11.834

hi : 1973.9 13.7293

lo : 1973.9 9.93872

fit: 1974.2 11.852

hi : 1974.2 13.7219

lo : 1974.2 9.98213

fit: 1974.5 11.87

hi : 1974.5 13.7146

lo : 1974.5 10.0254

fit: 1974.8 11.888

hi : 1974.8 13.7075

lo : 1974.8 10.0685

fit: 1975.1 11.906

hi : 1975.1 13.7005

lo : 1975.1 10.1115

fit: 1975.4 11.924

hi : 1975.4 13.6936

lo : 1975.4 10.1544

fit: 1975.7 11.942

hi : 1975.7 13.687

lo : 1975.7 10.197

fit: 1976 11.96

hi : 1976 13.6805

lo : 1976 10.2395

fit: 1976.3 11.978

hi : 1976.3 13.6741

lo : 1976.3 10.2819

fit: 1976.6 11.996

hi : 1976.6 13.668

lo : 1976.6 10.324

fit: 1976.9 12.014

hi : 1976.9 13.6621

lo : 1976.9 10.3659

fit: 1977.2 12.032

hi : 1977.2 13.6563

lo : 1977.2 10.4077

fit: 1977.5 12.05

hi : 1977.5 13.6508

lo : 1977.5 10.4492

fit: 1977.8 12.068

hi : 1977.8 13.6455

lo : 1977.8 10.4905

fit: 1978.1 12.086

hi : 1978.1 13.6404

lo : 1978.1 10.5316

fit: 1978.4 12.104

hi : 1978.4 13.6355

lo : 1978.4 10.5725

fit: 1978.7 12.122

hi : 1978.7 13.6309

lo : 1978.7 10.6131

fit: 1979 12.14

hi : 1979 13.6266

lo : 1979 10.6534

fit: 1979.3 12.158

hi : 1979.3 13.6225

lo : 1979.3 10.6935

fit: 1979.6 12.176

hi : 1979.6 13.6188

lo : 1979.6 10.7332

fit: 1979.9 12.194

hi : 1979.9 13.6153

lo : 1979.9 10.7727

fit: 1980.2 12.212

hi : 1980.2 13.6121

lo : 1980.2 10.8119

fit: 1980.5 12.23

hi : 1980.5 13.6093

lo : 1980.5 10.8507

fit: 1980.8 12.248

hi : 1980.8 13.6068

lo : 1980.8 10.8892

fit: 1981.1 12.266

hi : 1981.1 13.6047

lo : 1981.1 10.9273

fit: 1981.4 12.284

hi : 1981.4 13.6029

lo : 1981.4 10.9651

fit: 1981.7 12.302

hi : 1981.7 13.6016

lo : 1981.7 11.0024

fit: 1982 12.32

hi : 1982 13.6006

lo : 1982 11.0394

fit: 1982.3 12.338

hi : 1982.3 13.6001

lo : 1982.3 11.0759

fit: 1982.6 12.356

hi : 1982.6 13.6

lo : 1982.6 11.112

fit: 1982.9 12.374

hi : 1982.9 13.6004

lo : 1982.9 11.1476

fit: 1983.2 12.392

hi : 1983.2 13.6013

lo : 1983.2 11.1827

fit: 1983.5 12.41

hi : 1983.5 13.6027

lo : 1983.5 11.2173

fit: 1983.8 12.428

hi : 1983.8 13.6046

lo : 1983.8 11.2514

fit: 1984.1 12.446

hi : 1984.1 13.6071

lo : 1984.1 11.2849

fit: 1984.4 12.464

hi : 1984.4 13.6101

lo : 1984.4 11.3179

fit: 1984.7 12.482

hi : 1984.7 13.6138

lo : 1984.7 11.3502

fit: 1985 12.5

hi : 1985 13.618

lo : 1985 11.382

fit: 1985.3 12.518

hi : 1985.3 13.6229

lo : 1985.3 11.4131

fit: 1985.6 12.536

hi : 1985.6 13.6285

lo : 1985.6 11.4435

fit: 1985.9 12.554

hi : 1985.9 13.6348

lo : 1985.9 11.4732

fit: 1986.2 12.572

hi : 1986.2 13.6418

lo : 1986.2 11.5022

fit: 1986.5 12.59

hi : 1986.5 13.6495

lo : 1986.5 11.5305

fit: 1986.8 12.608

hi : 1986.8 13.658

lo : 1986.8 11.558

fit: 1987.1 12.626

hi : 1987.1 13.6672

lo : 1987.1 11.5848

fit: 1987.4 12.644

hi : 1987.4 13.6772

lo : 1987.4 11.6108

fit: 1987.7 12.662

hi : 1987.7 13.6881

lo : 1987.7 11.6359

fit: 1988 12.68

hi : 1988 13.6998

lo : 1988 11.6602

fit: 1988.3 12.698

hi : 1988.3 13.7123

lo : 1988.3 11.6837

fit: 1988.6 12.716

hi : 1988.6 13.7258

lo : 1988.6 11.7062

fit: 1988.9 12.734

hi : 1988.9 13.74

lo : 1988.9 11.728

fit: 1989.2 12.752

hi : 1989.2 13.7552

lo : 1989.2 11.7488

fit: 1989.5 12.77

hi : 1989.5 13.7712

lo : 1989.5 11.7688

fit: 1989.8 12.788

hi : 1989.8 13.7882

lo : 1989.8 11.7878

fit: 1990.1 12.806

hi : 1990.1 13.806

lo : 1990.1 11.806

fit: 1990.4 12.824

hi : 1990.4 13.8248

lo : 1990.4 11.8232

fit: 1990.7 12.842

hi : 1990.7 13.8444

lo : 1990.7 11.8396

fit: 1991 12.86

hi : 1991 13.865

lo : 1991 11.855

fit: 1991.3 12.878

hi : 1991.3 13.8864

lo : 1991.3 11.8696

fit: 1991.6 12.896

hi : 1991.6 13.9087

lo : 1991.6 11.8833

fit: 1991.9 12.914

hi : 1991.9 13.9319

lo : 1991.9 11.8961

fit: 1992.2 12.932

hi : 1992.2 13.9559

lo : 1992.2 11.9081

fit: 1992.5 12.95

hi : 1992.5 13.9808

lo : 1992.5 11.9192

fit: 1992.8 12.968

hi : 1992.8 14.0065

lo : 1992.8 11.9295

fit: 1993.1 12.986

hi : 1993.1 14.0329

lo : 1993.1 11.9391

fit: 1993.4 13.004

hi : 1993.4 14.0602

lo : 1993.4 11.9478

fit: 1993.7 13.022

hi : 1993.7 14.0883

lo : 1993.7 11.9557

fit: 1994 13.04

hi : 1994 14.117

lo : 1994 11.963

fit: 1994.3 13.058

hi : 1994.3 14.1465

lo : 1994.3 11.9695

fit: 1994.6 13.076

hi : 1994.6 14.1767

lo : 1994.6 11.9753

fit: 1994.9 13.094

hi : 1994.9 14.2076

lo : 1994.9 11.9804

fit: 1995.2 13.112

hi : 1995.2 14.2391

lo : 1995.2 11.9849

fit: 1995.5 13.13

hi : 1995.5 14.2713

lo : 1995.5 11.9887

fit: 1995.8 13.148

hi : 1995.8 14.304

lo : 1995.8 11.992

fit: 1996.1 13.166

hi : 1996.1 14.3374

lo : 1996.1 11.9946

fit: 1996.4 13.184

hi : 1996.4 14.3713

lo : 1996.4 11.9967

fit: 1996.7 13.202

hi : 1996.7 14.4057

lo : 1996.7 11.9983

fit: 1997 13.22

hi : 1997 14.4407

lo : 1997 11.9993

fit: 1997.3 13.238

hi : 1997.3 14.4761

lo : 1997.3 11.9999

fit: 1997.6 13.256

hi : 1997.6 14.512

lo : 1997.6 12

fit: 1997.9 13.274

hi : 1997.9 14.5484

lo : 1997.9 11.9996

fit: 1998.2 13.292

hi : 1998.2 14.5852

lo : 1998.2 11.9988

fit: 1998.5 13.31

hi : 1998.5 14.6224

lo : 1998.5 11.9976

fit: 1998.8 13.328

hi : 1998.8 14.6601

lo : 1998.8 11.9959

fit: 1999.1 13.346

hi : 1999.1 14.6981

lo : 1999.1 11.9939

fit: 1999.4 13.364

hi : 1999.4 14.7364

lo : 1999.4 11.9916

fit: 1999.7 13.382

hi : 1999.7 14.7752

lo : 1999.7 11.9888

fit: 2000 13.4

hi : 2000 14.8142

lo : 2000 11.9858

fit: 2000.3 13.418

hi : 2000.3 14.8536

lo : 2000.3 11.9824

fit: 2000.6 13.436

hi : 2000.6 14.8933

lo : 2000.6 11.9787

fit: 2000.9 13.454

hi : 2000.9 14.9332

lo : 2000.9 11.9748

fit: 2001.2 13.472

hi : 2001.2 14.9735

lo : 2001.2 11.9705

fit: 2001.5 13.49

hi : 2001.5 15.014

lo : 2001.5 11.966

fit: 2001.8 13.508

hi : 2001.8 15.0547

lo : 2001.8 11.9613

fit: 2002.1 13.526

hi : 2002.1 15.0957

lo : 2002.1 11.9563

fit: 2002.4 13.544

hi : 2002.4 15.137

lo : 2002.4 11.951

fit: 2002.7 13.562

hi : 2002.7 15.1784

lo : 2002.7 11.9456

fit: 2003 13.58

hi : 2003 15.2201

lo : 2003 11.9399

fit: 2003.3 13.598

hi : 2003.3 15.262

lo : 2003.3 11.934

fit: 2003.6 13.616

hi : 2003.6 15.3041

lo : 2003.6 11.9279

fit: 2003.9 13.634

hi : 2003.9 15.3463

lo : 2003.9 11.9217

fit: 2004.2 13.652

hi : 2004.2 15.3888

lo : 2004.2 11.9152

fit: 2004.5 13.67

hi : 2004.5 15.4314

lo : 2004.5 11.9086

fit: 2004.8 13.688

hi : 2004.8 15.4742

lo : 2004.8 11.9018

fit: 2005.1 13.706

hi : 2005.1 15.5171

lo : 2005.1 11.8949

fit: 2005.4 13.724

hi : 2005.4 15.5602

lo : 2005.4 11.8878

fit: 2005.7 13.742

hi : 2005.7 15.6034

lo : 2005.7 11.8806

fit: 2006 13.76

hi : 2006 15.6468

lo : 2006 11.8732

fit: 2006.3 13.778

hi : 2006.3 15.6903

lo : 2006.3 11.8657

fit: 2006.6 13.796

hi : 2006.6 15.7339

lo : 2006.6 11.8581

fit: 2006.9 13.814

hi : 2006.9 15.7777

lo : 2006.9 11.8503

fit: 2007.2 13.832

hi : 2007.2 15.8216

lo : 2007.2 11.8424

fit: 2007.5 13.85

hi : 2007.5 15.8656

lo : 2007.5 11.8344

fit: 2007.8 13.868

hi : 2007.8 15.9097

lo : 2007.8 11.8263

fit: 2008.1 13.886

hi : 2008.1 15.9539

lo : 2008.1 11.8181

fit: 2008.4 13.904

hi : 2008.4 15.9982

lo : 2008.4 11.8098

fit: 2008.7 13.922

hi : 2008.7 16.0426

lo : 2008.7 11.8014