// define bit masks to extract data from specific locations
// of pixie16 data
static const uint32_t CHANNELIDMASK     =        0xF; // Bits 0-3 inclusive
static const uint32_t SLOTIDMASK        =       0xF0; // Bits 4-7 inclusive
static const uint32_t CRATEIDMASK       =      0xF00; // Bits 8-11 inclusive
static const uint32_t HEADERLENGTHMASK  =    0x1F000; // Bits 12-16 inclusive
static const uint32_t CHANNELLENGTHMASK = 0x3FFE0000; // Bits 17-29 inclusive
static const uint32_t OVERFLOWMASK      = 0x40000000; // Bit 30 has overflow information (1 - overflow)
static const uint32_t FINISHCODEMASK    = 0x80000000; // Bit 31 has pileup information (1 - pileup)
static const uint32_t LOWER16BITMASK    =     0xFFFF; // Lower 16 bits
static const uint32_t UPPER16BITMASK    = 0xFFFF0000; // Upper 16 bits
static const uint32_t LOWER12BITMASK    =      0xFFF; // Lower 12 bits
static const uint32_t BIT31MASK         = 0x80000000; // Bit 31 
static const uint32_t BIT30MASK         = 0x40000000; // Bit 30 
static const uint32_t BIT30to29MASK     = 0x60000000; // Bits 30 through 29
static const uint32_t BIT31to29MASK     = 0xE0000000; // Bits 31 through 29
static const uint32_t BIT30to16MASK     = 0x7FFF0000; // Bits 30 through 16
static const uint32_t BIT29to16MASK     = 0x3FFF0000; // Bits 29 through 16
static const uint32_t BIT28to16MASK     = 0x1FFF0000; // Bits 28 through 16

// number of words added to pixie16 channel event header when energy sums
// and baselines are recorded
static const uint32_t SIZEOFESUMS       =         4;
// number of words added to pixie16 channel event header when QDC sums
// are recorded
static const uint32_t SIZEOFQDCSUMS     =         8;